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