The Key of F# — Guitar
The tonic, subdominant and dominant chords, and what this chair plays across them.
F# major harmonises to F# – G#m – A#m – B – C# – D#m – F°; F# minor to F#m – G#° – A – Bm – C#m – D – E. Most of the country repertoire in this key lives on three of those chords — the tonic, the subdominant and the dominant — plus the relative minor when a song wants one darker turn.
The guitar chair carries the boom-chick floor — a bass note on the strong beats, a strum answering it on the weak ones: the shape below is what a right hand strums, and which bass note opens it decides how the boom half of boom-chick actually walks.
Learn the tonic-subdominant-dominant grammar in F# until your hand goes there without asking, then add the relative minor, and most of the repertoire in this key is already playable.