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Wave in G#
Wave in G# — Jobim at his most harmonically refined, with elegant chromatic voice leading throughout. Lydian mode suits the floating tonic sections; Lydian Dominant captures the characteristic altered dominant sound. Changes: G#maj7 – Edim7 – D#m7 – G#7b9 – C#maj7 – C#m6 – C13 – C7b13 – F9 – F7b9 – A#9 – E7 – D#7 – G#m7 – C#7 – C#m7/E – F#7/E – Bmaj7/D# – Bm7/D – E7/D.
Key of G#
G# major (or Ab) lives at fret 4 on the low E string. All chords require barre technique, making it less common in guitar-centric songwriting but standard in piano-driven pop. Guitarists often use a capo to access friendlier shapes. G# is a intermediate-advanced-level key on guitar because the open G string is a half step below the root, creating dissonance — avoid letting it ring. Expect to rely on barre chords throughout, which builds hand strength and unlocks the entire fretboard.
Voice Leading
The bass line moves through G# to E (descending major third), E to D# (descending half step), D# to G# (ascending perfect fourth), G# to C# (ascending perfect fourth), C# to C# (ascending unison), C# to C (descending half step), C to C (ascending unison), C to F (ascending perfect fourth), F to F (ascending unison), F to A# (ascending perfect fourth), A# to E (ascending tritone), E to D# (descending half step), 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 B (ascending perfect fourth), B to B (ascending unison), B to E (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 E to G# by major third.
Scales for Improvisation
G# 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, G# Mixolydian adds the flat seventh for an authentic blues-rock edge.