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Windows in A#
Chick Corea's post-bop composition layers Lydian Dominant tension and Bebop Major clarity over a fluid A# architecture. Dorian inflections soften the dominant color and give improvisers multiple entry points for expressive phrase building. Study the A#m7 – Gm7b5 – C7 – Fm7 – C#7sus4 – D#maj7#11 – G7 – G#7 – D#maj7 – D#maj7/D# – Cm7 – Cm7/B – Am7b5 – Am7b5/Ab – D7/G – D7 – Gm7 – Gm7/Gb – C7/F – Dm7 – B7#11 – A#maj7 changes to develop sophisticated vocabulary for post-bop major/dominant modal interplay.
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 A# to G (descending minor third), G to C (ascending perfect fourth), C to F (ascending perfect fourth), F to C# (descending major third), C# to D# (ascending whole step), D# to G (ascending major third), G to G# (ascending half step), G# to D# (descending perfect fourth), D# to D# (ascending unison), D# to C (descending minor third), C to C (ascending unison), C to A (descending minor third), A to A (ascending unison), A to D (ascending perfect fourth), D to D (ascending unison), D to G (ascending perfect fourth), G to G (ascending unison), G to C (ascending perfect fourth), C to D (ascending whole step), D to B (descending minor third), B to A# (descending half 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 A# to A# by unison.
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.