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The Duke 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 D# to A# (descending perfect fourth), A# to A (descending half step), A to E (descending perfect fourth), E to A (ascending perfect fourth), A to D (ascending perfect fourth), D to G# (ascending tritone), G# to D# (descending perfect fourth), D# to C (descending minor third), C to B (descending half step), B to C# (ascending whole step), C# to A (descending major third), A to A# (ascending half step), A# to F# (descending major third), F# to C# (descending perfect fourth), C# to G# (descending perfect fourth), G# to F (descending minor third), F to C (descending perfect fourth), C to E (ascending major third), E to A# (ascending tritone), A# to B (ascending half step), B to D (ascending minor third), D to C (descending whole step), C to F# (ascending tritone), F# to D# (descending minor third), D# to A# (descending perfect fourth), A# to C (ascending whole step), C to D# (ascending minor third), D# to A# (descending perfect fourth), A# to F (descending perfect fourth), F to D# (descending whole step), D# to G# (ascending perfect fourth), G# to D# (descending perfect fourth), D# to B (descending major third), B to F# (descending perfect fourth), F# to D# (descending 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 D# 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.