Harmonicas are not really in the mainstream of bluegrass instruments, but have been featured by many bluegrass bands, most famously, Flatt and Scruggs. Harmonicas make sound by blowing air into or drawing air out of the reed chamber. Each reed is a different length, with the longer reeds providing the lower tones and the shorter reeds providing the higher tones. Hohner harmonicas are the most famous brand and we carry a great section here. Please call us should you have any special order Hohner harmonicas. We also carry the highly-acclaimed Lee Oskar harmonicas.