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Afro Blue in A#
Afro Blue in A# — Mongo Santamaria's Afro-Cuban gem in 6/8, transformed into a modal jazz statement by Coltrane. Dorian defines the rocking minor vamp; Harmonic Minor and Minor Pentatonic add blues depth. Changes: A#m7 – F#7#9/C# – F7#9/C – G# – F#.
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 F# (descending major third), F# to F (descending half step), F to G# (ascending minor third), G# to F# (descending whole step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The mix of stepwise and leap motion balances smoothness with harmonic drive. When the progression loops, the bass returns from F# to A# by major third.
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.