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C'est Si Bon in D#
Key of D#
D# major (Eb) requires barre shapes rooted on the 6th and 5th strings. It is a favorite key for horn players, so guitarists encounter it in funk and soul bands. Using barre chords at frets 1, 3, and 6 covers the primary shapes. D# is a intermediate-advanced-level key on guitar because no standard open strings match this key's chord tones. Expect to rely on barre chords throughout, which builds hand strength and unlocks the entire fretboard.
Voice Leading
The bass line moves through F# to D# (descending minor third), D# to F (ascending whole step), F to A# (ascending perfect fourth), A# to A# (ascending unison), A# to D# (ascending perfect fourth), D# to C (descending minor third), C to G (descending perfect fourth), G to D (descending perfect fourth), D to C# (descending half step), C# to A# (descending minor third), A# to B (ascending half step), B to D# (ascending major third), D# to F# (ascending minor third), F# to C# (descending perfect fourth), C# to G# (descending perfect fourth), G# to B (ascending minor third), B to B (ascending unison), B to C (ascending half step), C to F (ascending perfect fourth), F to F (ascending unison), F to F# (ascending half step), F# to F (descending half step), F to G (ascending whole step), G to C (ascending perfect fourth), C to G# (descending major third), G# to B (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 B to F# by perfect fourth.
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.