Hot House in A#

Hot House in A#

Dizzy Gillespie's bebop contrafact over "What Is This Thing Called Love" adds Bebop Major vocabulary and Harmonic Minor tension to a A# foundation. Locrian color appears at pivotal moments, testing a soloist's command of altered and diminished harmonic space. The Fm7b5 – A#7b9 – D#m – Cm7b5 – F7b9 – A#Maj7 – Cm7 – F7 changes are a bebop rite of passage that separates the fluent improviser from the merely competent.

Hot House 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 F to A# (ascending perfect fourth), A# to D# (ascending perfect fourth), D# to C (descending minor third), C to F (ascending perfect fourth), F to A# (ascending perfect fourth), A# to C (ascending whole step), C to F (ascending perfect fourth). 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 F to F 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.