I currently have 7 Special 20’s that came as a set (A, Bb, C, D, E, F, G) and 2 Lee Oskars (low E & low F). I actually use them all occasionally as my wife and I jam with friends as a duo and play in all keys. Mostly we play folk, country, and America music. Recently a friend of mine who’s played many years with a country band said now I should get an A minor harmonica – specifically a Lee Oskar harmonic minor.
I know nothing about minor harmonicas, so my question is: what are they good for? How could I use one in the type of music we usually play? Would I be better off spending my money on another major key harmonica to fill in the gaps in my collection?