Setembro

Setembro in D

Key of D

D major is one of guitar's most resonant keys. The open D string acts as a droning root, and the open A string provides the fifth. This gives D-based strumming a wide, ringing quality that flatpicks and fingerpicks love. D is a beginner-level key on guitar because the open D and A strings provide a powerful bass foundation, and the open high E is the 2nd scale degree adding brightness. Beginners will find this key approachable since most chords use open voicings with minimal stretching.

Voice Leading

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

Scales for Improvisation

D 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, D Mixolydian adds the flat seventh for an authentic blues-rock edge.