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Invitation in A#
Invitation in A#: Bronisław Kaper's mysterious minor standard carries an unsettling harmonic pull. Dorian governs the stable stretches while Lydian Dominant and Altered scales navigate the chromatic dominant motion. Chords: A#m7 – D#7 – G#7 – C#m7 – F#7 – B7#11 – Bm7 – E7 – E7alt – Am7 – D7 – D7alt – Gm7 – C7 – C7alt – Fm7 – C#7#11 – C7b9 – F7alt – A7#11 – D#m7b5 – G#7#9 – C#mMaj7.
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 D# (ascending perfect fourth), D# to G# (ascending perfect fourth), G# to C# (ascending perfect fourth), C# to F# (ascending perfect fourth), F# to B (ascending perfect fourth), B to B (ascending unison), B to E (ascending perfect fourth), E to E (ascending unison), E to A (ascending perfect fourth), A to D (ascending perfect fourth), D to D (ascending unison), D to G (ascending perfect fourth), G to C (ascending perfect fourth), C to C (ascending unison), C to F (ascending perfect fourth), F to C# (descending major third), C# to C (descending half step), C to F (ascending perfect fourth), F to A (ascending major third), A to D# (ascending tritone), D# to G# (ascending perfect fourth), G# to C# (ascending perfect fourth). 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 A# by minor 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.