Bebop

History and character

Bebop is the jazz revolution born in the early 1940s in New York, in the late-night jam sessions at Minton's Playhouse and Monroe's Uptown House in Harlem, and then in the clubs of 52nd Street. The protagonists: Charlie Parker (alto sax), Dizzy Gillespie (trumpet), Thelonious Monk (pianist and composer, house pianist at Minton's), Bud Powell (piano), Kenny Clarke and Max Roach (drums), Charlie Christian (guitar), Oscar Pettiford and Ray Brown (double bass), then Miles Davis, Fats Navarro, J.J. Johnson, Dexter Gordon. The key early recordings arrive in 1945 (“Salt Peanuts,” “Shaw 'Nuff” by Gillespie and Parker; “Ko-Ko” and “Now's the Time” by Parker), after the recording ban of 1942–44.

Bebop moves jazz from the dance floor to the listening room: small groups (quintet of trumpet–sax–piano–double bass–drums), very fast tempos, intricate themes played in unison, dense harmonies with extensions and alterations (9, #11, 13, b9, #9), substitutions and contrafacts (new melodies written over the chords of existing standards: “Donna Lee” on “(Back Home Again in) Indiana,” “Ornithology” on “How High the Moon,” “Anthropology” on rhythm changes, “Ko-Ko” on “Cherokee”). Improvisation becomes virtuosic and harmonically precise: lines of eighth notes that “draw” the chords with chromatic approaches.

Drummer Kenny Clarke moves the pulse from the kick to the ride, freeing the kick and snare for unpredictable accents (“dropping bombs”). Bebop is the foundation of the modern jazz language: hard bop, cool, modal and post-bop all derive from it; Gillespie, with Chano Pozo, also opens up cubop (Latin jazz).

Scales and keys

Bebop dominant

• Formula: 1 2 3 4 5 6 b7 7 — eight notes: Mixolydian + passing major 7.
• On G (for G7): G A B C D E F F#.
• Characteristic note: the chromatic major 7 (F#) between b7 and the root: it keeps the chord tones (G B D F) on the strong beats when descending in eighth notes from the root.
• Use: descending lines over dominants; start from a chord tone on the downbeat.
• Real example: Charlie Parker's phrasing over all dominants (Billie's Bounce, Now's the Time).
• Common mistakes: starting from the wrong note (a passing tone on the downbeat shifts everything); using it ascending without criteria.

Bebop major

• Formula: 1 2 3 4 5 #5 6 7. On C: C D E F G G# A B.
• Characteristic note: the passing #5 (G#) between 5 and 6. Barry Harris harmonizes it by alternating C6 (C E G A) and Bdim7 (B D F Ab).
• Use: over major tonics, descending.

Bebop Dorian (bebop minor)

• Formula: 1 2 b3 3 4 5 6 b7. On D: D E F F# G A B C.
• Characteristic note: the passing major 3 (F#): these are the same notes as the G bebop dominant, so a Dm7–G7 ii–V can be played with a single scale.

Altered (Super Locrian)

• Formula: 1 b2 #2 3 #4 b6 b7 (= 1 b9 #9 3 #11 b13 b7). On G: G Ab Bb B Db Eb F.
• Origin: seventh mode of Ab melodic minor (Ab Bb B Db Eb F G).
• Characteristic note: all the altered tensions: the “maximally tense” dominant before resolving.
• Chords: G7alt, G7#9b13, G7b9#11.
• Real example: altered V7s in minor ii–Vs (Dizzy Gillespie — A Night in Tunisia; Bud Powell).

Half-step/whole-step diminished

• Formula: 1 b9 #9 3 #11 5 13 b7. On G: G Ab Bb B C# D E F.
• Characteristic note: b9 with natural 13: G13b9.
• Use: over V7b9 dominants that resolve to major; diminished arpeggios (B D F Ab) over G7.

Melodic minor and Locrian #2

• Melodic minor on C: C D Eb F G A B (minor tonic Cm6/CmMaj7).
• Locrian #2 on D: D E F G Ab Bb C (Dø7 in the minor ii–V).

Blues

• On F: F Ab Bb B C Eb. Bebop uses the blues as a main form (dozens of “bebop blues” in F and Bb), mixing the blues scale with bebop lines.

Melodic techniques (not scales but essential)

• Enclosure: surrounding the target note with the diatonic note above and the semitone below (to arrive on E: F–D#–E).
• Chromatic approach from below and from above.
• 3–5–7–9 arpeggios (from Dm7: F A C E = “Fmaj7 over Dm7”).
• Phrases that start on the upbeat and end on the upbeat.

How to choose

Harmony

Fast harmonic rhythm

Two chords per bar, often at 250+ BPM: a ii–V in every bar. The improviser must make each change “heard” with chord tones on the strong beats.

Substitutions

• ii–V in place of V (G7 → Dm7 G7).
• Tritone substitution (Db7 in place of G7).
• Chained secondary dominants (E7 A7 D7 G7).
• Altered chords (b9, #9, #5, #11) on all dominants.
• Reharmonization of standards: chains of “descending” ii–Vs by semitone.

Contrafacts

A new theme over the chords of a standard: Donna Lee (Indiana), Ornithology (How High the Moon), Anthropology and Oleo (rhythm changes), Ko-Ko (Cherokee), Groovin' High (Whispering), Hot House (What Is This Thing Called Love).

Forms

Rhythm changes (32-bar AABA in Bb), 12-bar blues (in F and Bb), AABA and ABAC standards.

Voicing

Piano: Bud Powell plays shell voicings (1–7 or 1–3, 1–3–7) in the left hand and lines in the right; Monk uses clusters, minor seconds, whole tones. Horns in unison or in octaves on the head.

Typical progressions

Rhythm and groove

Feel

Very fast swing: at tempos above 250 BPM the eighth notes approach an even ratio (1.2–1.4:1), with accents on the upbeats and phrases that begin and end in unpredictable positions. The time is kept by the ride and the double bass; the hi-hat closes on 2 and 4.

Accents and phrasing

The lines are continuous eighth notes with accents on the high notes and the upbeats, ghost notes (notes barely played) on the low notes, triplets and sixteenth notes as ornaments. Themes often end with an accent on the “&” of 4 (the classic “bebop” ending).

Bombs and interplay

Kick and snare don't hold a pattern: they accent, respond, “drop bombs.” The rhythm section is a conversation.

Microtiming

The double bass pushes slightly forward (on top), the ride is precise, the soloist often “stays behind” to create tension.

Drums

Principle

Kenny Clarke and Max Roach transform the drums: the time passes to the ride (spang-a-lang) and the hi-hat, while kick and snare become free voices that converse with the soloist and underline the form.

Ride

Spang-a-lang on a triplet grid (1, 2, 2-a, 3, 4, 4-a); at very fast tempos almost only quarter notes with accents on 2 and 4. It is the main sound: it must be constant and light.

Hi-hat

On 2 and 4, always. It is the “anchor” of the time.

Kick

It doesn't play the quarter notes: bombs (strong accents) on upbeats or in unexpected places, often to underline an accent in the theme or the end of a soloist's phrase.

Snare

Comping on the third triplets (the “a”s), ghost notes, occasional rimshots, responses to the soloist's phrases. Brushes in ballads.

Dynamics and velocity

Ride medium (velocity 80–100), comping 30–70, bombs 100–120. The dynamics build during the solos.

Interaction with the bass and the soloist

The ride and walking bass form the pulse; the drums listen to the soloist's phrases and “fill” the pauses.

Sections

Head: unison accents with the horns (kicks of the theme). Solos: increasing comping. Trading fours/eights: 4- or 8-bar drum solos alternating with the horns, respecting the form. Final head and coda (often a break and a final chord).

Fills

Short and melodic, in triplets or swung eighth notes, leading into the new section; in the exchanges, true solos.

Sounds

“Bop” kit: 18–20" kick tuned high and resonant (sounds like a low tom), bright 14" snare, 12" and 14" toms, dark 20" ride with many overtones, 14" hi-hat.

Typical mistakes

Four-on-the-floor kick (big band swing style) or on 1 and 3 (rock), comping too loud, uneven ride at fast tempos, fills that break the 32-bar form.

Bass

Sound

Double bass with gut strings (until the 1950s) or metal strings, a round, percussive sound, very “inside” the time.

Fast walking

One note per quarter even at 280 BPM: chord tone on the first beat of each change (root or third), then chromatic passing tones; with two chords per bar, two notes per chord (root + approach note to the next).

Example

Dm7 and G7 in the same bar, then Cmaj7: D (root of Dm7) – Ab (chromatic approach from above to G) | G (root of G7) – C# or B (approach to C) | C. Rule: two notes per chord, the first a chord tone, the second a semitone above or below the next root.

Historical examples

Oscar Pettiford, Ray Brown (with Dizzy Gillespie), Tommy Potter (with Parker), Curly Russell, Percy Heath.

Harmonic instruments

• Piano: sparse, syncopated comping; Bud Powell with shell voicings (1–7, 1–3) in the left hand and bebop lines in the right; Thelonious Monk with dissonances, clusters, whole tones, silences; Al Haig, Duke Jordan, Hank Jones.
• Guitar: Charlie Christian (amplified single-note lines, precursor), then Tal Farlow, Barney Kessel; comping with 3-note chords.
• Vibraphone: Milt Jackson (from 1945 with Gillespie).

Melody and vocals

Themes

Themes of fast eighth notes, angular, with chromaticism, leaps and displaced accents, played in unison or in octaves by sax and trumpet; they often end with the classic two-short-note “be-bop” motif.

Improvisation

Lines of eighth notes that outline the chords (guide tones on the strong beats), enclosures, chromatic approaches, arpeggios of the extensions (3–5–7–9), quotations, long phrases that cross the bar lines at the changes, “double time” in ballads.

Voice

Virtuosic scat (Ella Fitzgerald — “How High the Moon” 1960 live, Sarah Vaughan, Babs Gonzales); vocalese (lyrics written over solos: Eddie Jefferson, King Pleasure).

Effects

None.

Instruments

• Alto sax, tenor sax
• Trumpet, trombone
• Piano
• Double bass
• Drums (ride at the center of the sound)
• Guitar, vibraphone
• Congas (cubop, Chano Pozo with Gillespie)

Drum patterns

Synths and sounds

• Piano V — Piano: Grand piano with close mics; medium-low dynamics for comping, a stronger touch for solos; club ambience (room 0.8–1.2 s).
• Stage-73 V — Rhodes: Modern takes on bebop (electric Chick Corea, Robert Glasper): rootless voicings and bebop lines.

Song structure

Form

• Intro (often 4–8 bars: last bars of the form or a vamp).
• Head in unison (1 chorus; in the blues often 2 choruses of 12).
• Solos: sax, trumpet, piano, each 2–8 choruses.
• Trading fours with the drums (1–2 choruses).
• Final head.
• Coda: tag, break and ending with an accent on the “&” of 4 or a held chord.
• Length 3:00 (1945 78 rpm) – 10:00 (live).

Arrangement

Very little written arrangement: intro, head, possible “interludes” or “send-offs” (a 2–4-bar break that launches the first solo, as in A Night in Tunisia), coda.

Mixing and mastering

Sonic goal

An acoustic combo in a club: horns up front, a clear and continuous ride, a double bass that is defined even at fast tempos, piano slightly behind. Period recordings are mono and have little definition; a modern bebop record follows Rudy Van Gelder's practice (close mics, little reverb, present sound). Loudness −16/−13 LUFS, high PLR.

Drums

• Overheads: HP 50 Hz; 400 Hz −2 dB; clear ride (3–6 kHz). The ride must sit above the snare.
• Kick: distant mic or none; 60–100 Hz in moderation.
• Snare: comping and ghost notes present at 2–5 kHz; no compression or 1–2 dB.
• Pan: overheads 60–80%; toms and cymbals where they sit.

Double bass

HP 40 Hz; 100 Hz body; −3 dB at 200–250 Hz; +2/+3 dB at 700 Hz–1 kHz and +1/+2 dB at 2.5 kHz to hear the notes at fast tempos; opto 3–4 dB. Center.

Piano

HP 50 Hz; −2 dB at 300 Hz; presence 2–4 kHz; compression 1–2 dB; pan 20–40% or narrow stereo.

Sax and trumpet

HP 80–100 Hz; −2 dB at 400 Hz if nasal; presence 2–3 kHz; light de-esser on the trumpet at 3–5 kHz if it cuts; opto compression 2–3 dB. Pan: trumpet −20%, sax +20% (or both near the center). Shared reverb.

Vocal (scat)

HP 80 Hz; presence 3 kHz; compression 3–5 dB; plate 1.5 s.

FX

Room or plate 1.2–1.8 s pre-delay 20 ms on everything; no delay.

Buses and groups

No aggressive compression; at most 1 dB on the mix bus.

Sidechain

Never.

Master

Chain: minimal EQ – limiter on the peaks. Target −16/−13 LUFS integrated, true peak −1 dBTP; don't compress, so as not to kill the comping and the ride.

Common mistakes

Muddy double bass whose notes can't be made out at fast tempos, a ride that is too bright and “sizzly,” compressed, flat horns, long reverb that blurs the eighth notes.

Mix reference tracks

Clifford Brown & Max Roach — Joy Spring (1954); Sonny Rollins — Oleo (1954); Bud Powell — Un Poco Loco (1951); Christian McBride — modern bebop (Live at the Village Vanguard).

Reference listening

• Dizzy Gillespie & Charlie Parker — Salt Peanuts (1945)
• Charlie Parker — Ko-Ko (1945)
• Charlie Parker — Now's the Time (1945)
• Dizzy Gillespie — A Night in Tunisia (1946)
• Charlie Parker — Ornithology (1946)
• Thelonious Monk — 'Round Midnight (1947)
• Charlie Parker — Donna Lee (1947)
• Bud Powell — Un Poco Loco (1951)
• Sonny Rollins — Oleo (1954)
• Clifford Brown & Max Roach — Joy Spring (1954)