Setembro

Setembro 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 G# to D# (descending perfect fourth), D# to F (ascending whole step), F to F (ascending unison), F to C# (descending major third), C# to G# (descending perfect fourth), G# to A# (ascending whole step), A# to A# (ascending unison), A# to G (descending minor third), G to C (ascending perfect fourth), C to F (ascending perfect fourth), F to C (descending perfect fourth), C to D (ascending whole step), D to D (ascending unison), D to E (ascending whole step), E to A (ascending perfect fourth), A to D (ascending perfect fourth), D to A (descending perfect fourth), A to B (ascending whole step), B to B (ascending unison), B to C# (ascending whole step), C# to F# (ascending perfect fourth), F# to B (ascending perfect fourth), B to D# (ascending major third), D# to G# (ascending perfect fourth), G# to C# (ascending perfect fourth), C# to F# (ascending perfect fourth), F# to B (ascending perfect fourth), B to E (ascending perfect fourth), E to E (ascending unison), E to A (ascending perfect fourth), A to A (ascending unison), A to F# (descending minor third), F# to B (ascending perfect fourth), B to F (ascending tritone), F to A# (ascending perfect fourth), A# to D# (ascending perfect fourth), D# to D# (ascending unison), D# to G# (ascending perfect fourth), G# to D# (descending perfect fourth), D# to G# (ascending perfect fourth), G# to G# (ascending unison). 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 G# by unison.

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.