Progressions in F# — 5-String Banjo

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. Each chord links to its 5-String Banjo voicings, so a tune in F# becomes a short list of shapes before the first repeat.

Then check the key against the short g: some keys let it ring free through every change, and some make it a note you have to work around. Knowing which is which is most of what "playing in a good key" means here.