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I Got Rhythm in A#
I Got Rhythm in A# — Gershwin's "rhythm changes," the foundation on which bebop was built. Bebop Major rules the A sections; Mixolydian connects the bridge's dominant chain moving in thirds. Changes: A#6 – Gm7 – Cm7 – F7 – Dm7 – A#7 – A#7/D – D#7 – Edim7 – A#6/F – D7 – G7 – C7 – D#9.
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 D (descending minor third), D to A# (descending major third), A# to A# (ascending unison), A# to D# (ascending perfect fourth), D# to E (ascending half step), E to A# (ascending tritone), A# to D (ascending major third), D to G (ascending perfect fourth), G to C (ascending perfect fourth), C to D# (ascending minor third). 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 D# to A# 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.