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Old Devil Moon in C#
Key of C#
C# major (or Db) sits in barre chord territory across the fretboard. Every chord demands precise barring, but the payoff is a bright, crystalline sound a half step above C that cuts through a band mix. C# is a intermediate-advanced-level key on guitar because no open strings fall within the key naturally, so every chord requires full barre technique. Expect to rely on barre chords throughout, which builds hand strength and unlocks the entire fretboard.
Voice Leading
The bass line moves through C# to G# (descending perfect fourth), G# to C# (ascending perfect fourth), C# to F# (ascending perfect fourth), F# to F# (ascending unison), F# to F# (ascending unison), F# to B (ascending perfect fourth), B to A (descending whole step), A to E (descending perfect fourth), E to G# (ascending major third), G# to D (ascending tritone), D to C# (descending half step), C# to A# (descending minor third), A# to A# (ascending unison), A# to A# (ascending unison), A# to A# (ascending unison), A# to D# (ascending perfect fourth), D# to D# (ascending unison), D# to G# (ascending perfect fourth), G# to D (ascending tritone), D to F# (ascending major third), F# to G# (ascending whole step), G# to E (descending major third), E to F (ascending half step), F to D (descending minor third), D to D# (ascending half step). 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 D# to C# by whole step.
Scales for Improvisation
C# 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, C# Mixolydian adds the flat seventh for an authentic blues-rock edge.