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Can't Take My Eyes Off You 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 D# to F# (ascending minor third), F# to C# (descending perfect fourth), C# to C# (ascending unison), C# to C# (ascending unison), C# to F# (ascending perfect fourth), F# to F# (ascending unison), F# to D# (descending minor third), D# to D# (ascending unison), D# to G# (ascending perfect fourth), G# to G# (ascending unison), G# to G# (ascending unison), G# to G# (ascending unison), G# to F# (descending whole step), F# to C# (descending perfect fourth), C# to A# (descending minor third), A# to F (descending perfect fourth), F to A# (ascending perfect fourth), A# to B (ascending half step), B to E (ascending perfect fourth), E to E (ascending unison), E to E (ascending unison), E to A (ascending perfect fourth), A to A (ascending unison), A to F# (descending minor third), F# to A (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 A to D# by tritone.
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.