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C'est Si Bon in G#
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 B to G# (descending minor third), G# to A# (ascending whole step), A# to D# (ascending perfect fourth), D# to D# (ascending unison), D# to G# (ascending perfect fourth), G# to F (descending minor third), F to C (descending perfect fourth), C to G (descending perfect fourth), G to F# (descending half step), F# to D# (descending minor third), D# to E (ascending half step), E to G# (ascending major third), G# to B (ascending minor third), B to F# (descending perfect fourth), F# to C# (descending perfect fourth), C# to E (ascending minor third), E to E (ascending unison), E to F (ascending half step), F to A# (ascending perfect fourth), A# to A# (ascending unison), A# to B (ascending half step), B to A# (descending half step), A# to C (ascending whole step), C to F (ascending perfect fourth), F to C# (descending major third), C# to E (ascending minor third). 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 B by perfect fourth.
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.