D on the Banjo, Every Scale

Every scale type this site maps, rooted on D and laid onto this chair. Country leans hard on three of them — major, the major pentatonic inside it, and the blues scale that bends the rest — and the other 21 are here for the song that needs one.

A banjo fill is usually still a roll, with the melody notes pushed to the top of it — the scale says which notes the fretting hand can put there, while the open strings and the high drone on the short fifth string keep ringing underneath.