Benjamin, lots of vitamin C--and read carefully what I said: (the harmonicas I own and the keys in which I play them) C [harmonica] for G blues. G IS the fifth in the C scale. The reason (aside from the bends) that it works so well is that the G scale has a flatted 7th, F instead of F#, which it is on a G harp (because, of course, that's what it is in the G major scale).--pedantictwitseed