Afro Blue in A#

Afro Blue in A#

Afro Blue in A#: Mongo Santamaria's Afro-Cuban jazz classic. Dorian and Harmonic Minor scales define the exotic, modal color of these sophisticated changes. Chords: A#m69 – F#7#9 – F7#9 – G# – F# – A#m – B13 – A#m7.

Afro Blue in 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), F# to A# (ascending major third), A# to B (ascending half step), B to A# (descending half step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The predominantly stepwise bass motion creates smooth, connected voice leading. 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.