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Your song in F#
Key of F#
F# major pushes guitarists into full barre territory at fret 2 and beyond. No open chords exist naturally, but the key rewards advanced players with dark, powerful voicings. Common in metal and progressive rock where low tunings bring it closer to standard pitch. F# is a intermediate-advanced-level key on guitar because the open B string is the 4th scale degree and the open high E is the minor 7th, both usable as color 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 B (ascending perfect fourth), B to C# (ascending whole step), C# to B (descending whole step), B to C# (ascending whole step), C# to A# (descending minor third), A# to D# (ascending perfect fourth), D# to D# (ascending unison), D# to D# (ascending unison), D# to B (descending major third), B to F# (descending perfect fourth), F# to C# (descending perfect fourth), C# to A# (descending minor third), A# to G# (descending whole step), G# to C# (ascending perfect fourth), C# to B (descending whole step), B to F# (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 F# to F# by unison.
Scales for Improvisation
F# 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. Layer in the full major scale for melodic runs, reserving the pentatonic for riff-based phrases.