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Epistrophy in A#
Monk's co-composed quirky anthem cycles through Mixolydian dominants and Lydian Dominant bridge tension rooted in A#. The signature chromatic whole-tone flavor makes Epistrophy instantly recognizable and technically demanding for improvisers. Drilling the B7 – C7 – E7#11 – C#7 – D7 – Em – A7 changes builds fluency with tritone-related dominant motion and Monk's distinctive rhythmic displacement.
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 B to C (ascending half step), C to E (ascending major third), E to C# (descending minor third), C# to D (ascending half step), D to E (ascending whole step), E to A (ascending perfect fourth). 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 A to B by whole step.
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.