How to practice 9:20 Special with play-along tracks?

Use the play-along backing track above to practice 9:20 Special in the key of A#. Listen to the audio with bass, piano, and drums, start by playing the melody, then practice improvisation and soloing over the chord changes.

What scales to use for soloing over 9:20 Special?

For soloing over 9:20 Special, recommended scales include: bebop, bebop major. Use arpeggio patterns over each chord to create melodic lines that follow the harmony of this jazz tune.

Who composed 9:20 Special?

9:20 Special was composed by Earle Warren / Jack Palmer / William Engvick in 1941. It is a swing standard in 4/4 time. The original key is C; this page shows it transposed to A#.

What key is 9:20 Special in?

The original key of 9:20 Special is C. The form is AB with 25 bars. This page shows the chart transposed to A#.

What scales work for improvising over 9:20 Special?

Recommended scales for 9:20 Special in A#: bebop, bebop major. Scales and arpeggios update in real-time as each chord plays, with context-aware analysis (e.g., Phrygian Dominant over secondary dominants).

How does the interactive backing track work?

The backing track plays with realistic walking bass, drum patterns, and voice-led chord voicings. Scales and arpeggios update in real-time as each chord plays. You can limit the fretboard zone for close-proximity voicings, toggle a reference melody, loop any section, and choose between multiple sound presets. Works for guitar, piano, bass, ukulele, and 7 more instruments.

Can I edit the chord chart?

Yes. You can modify the structure, chords, and arrangement of any standard to match your preferred version or create your own reharmonization.

9:20 Special in A#

Earle Warren / Jack Palmer / William Engvick(1941)swing

Do Re MiC D E

BPM: 120

Chord Diagrams — 9:20 Special in A# (Guitar)

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FingerNoteDegree

Chord Voicings Closest Voicing

9:20 Special in A#

Key of A#

A# (Bb) major requires barre chords rooted at fret 1 on the A string or fret 6 on the E string. Despite the barre demands, it is a common key in funk, New Orleans R&B, and brass band music. The open D string can ring as the major third for added color. A# is a intermediate-level key on guitar because the open D string is the major 3rd of Bb, adding a bright color if allowed to ring. Expect to rely on barre chords throughout, which builds hand strength and unlocks the entire fretboard.

Voice Leading

The bass line moves through C to D# (ascending minor third), D# to A# (descending perfect fourth), A# to G (descending minor third), G to F# (descending half step), F# to F (descending half step), F to A# (ascending perfect fourth), A# to F (descending perfect fourth), F to A# (ascending perfect fourth), A# to D# (ascending perfect fourth), D# to D# (ascending unison), D# to G (ascending major third), G to F (descending whole step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The root motion by larger intervals (fourths and fifths) gives each chord change a strong, decisive character. When the progression loops, the bass returns from F to C by perfect fourth.

Scales for Improvisation

A# major pentatonic works because every note is either a chord tone or a safe passing tone — there are no avoid notes. For soloing, this means you can play freely without clashing. Over dominant seventh chords, A# Mixolydian adds the flat seventh for an authentic blues-rock edge.

swing4/4 · 25 bars · Form: AB

Chords: C7, D♯m7, A♯6, G7, F♯7, F7, A♯, Fm7, A♯7, D♯Maj7, D♯6, Gm7, FMaj7.

Scales for Improvisation A# bebop, A# bebop major.

Diatonic chords: See all chords in the key of A#