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You Stepped Out Of A Dream in A#
Nacio Herb Brown's dreamy standard opens the door to Lydian color and Bebop Major vocabulary built over a flowing A# framework. The harmonic motion touches Dorian and Mixolydian territory, giving improvisers a wide palette. Study the A#maj7 – Bmaj7 – G#m7 – C#7 – F#maj7 – Fm7 – A#7 – D#maj7 – Gm7 – C7 – C#m7 – F#7 – Cm7 – F7 – E7#11 – D#7 – Cm7b5 – Dm7 – G7 progression to practice smooth modal transitions within a pop-jazz context.
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 B (ascending half step), B to G# (descending minor third), G# to C# (ascending perfect fourth), C# to F# (ascending perfect fourth), F# to F (descending half step), F to A# (ascending perfect fourth), A# to D# (ascending perfect fourth), D# to G (ascending major third), G to C (ascending perfect fourth), C to C# (ascending half step), C# to F# (ascending perfect fourth), F# to C (ascending tritone), C to F (ascending perfect fourth), F to E (descending half step), E to D# (descending half step), D# to C (descending minor third), C to D (ascending whole step), D to G (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 G 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.