La# Tritone Substitution
ii – bII7 – I progression in La# major
La# Tritone Substitution — ii – bII7 – I
In the A# tritone substitution (Cm – B – A#), the dominant V7 is replaced by a chord a tritone away — sharing the same guide tones but approaching the I from a half-step above. Lydian Dominant fits the substitute chord perfectly, while Dorian covers the ii. Bebop Major outlines the resolution. With seventh voicings (Cm7 – B7 – A#Maj7), the chromatic voice-leading creates the sophisticated sound central to bebop harmony.
Playing in La# major
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 C to B (descending half step), B to A# (descending half step). A half-step bass movement creates a strong leading-tone pull that demands resolution. The predominantly stepwise bass motion creates smooth, connected voice leading. When the progression loops, the bass returns from A# to C by whole step.
Capo Transposition
To play in A# using familiar open chords: capo 1 with open A shapes; capo 3 with open G shapes; capo 6 with open E shapes. Choose the capo position that gives you the voicings you prefer — lower capo positions produce a fuller sound, while higher positions create a brighter, mandolin-like timbre.
Scales for Soloing
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.
Strumming Pattern
Use Freddie Green-style comping: short, muted chord stabs on beats 2 and 4 at 120-160 BPM. Keep the chords tight and percussive, lifting your fretting hand slightly after each attack to control sustain.