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Your song 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 F# (ascending perfect fourth), F# to G# (ascending whole step), G# to F# (descending whole step), F# to G# (ascending whole step), G# to F (descending minor third), F to A# (ascending perfect fourth), A# to A# (ascending unison), A# to A# (ascending unison), A# to F# (descending major third), F# to C# (descending perfect fourth), C# to G# (descending perfect fourth), G# to F (descending minor third), F to D# (descending whole step), D# to G# (ascending perfect fourth), G# to F# (descending whole step), F# to C# (descending perfect fourth). 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 C# to C# by unison.
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. Use the Lydian mode (raised 4th) over the IV chord for a dreamy, floating quality that lifts the harmony.