- Key of D - 10 hole harmonica - high quality brass reeds - Black with matt finish, Comb: Copper-coloured - Incl. soft case and cleaning cloth The Cascha blues harmonica offers professional quality for a small budget. Its fine appearance and easy handling guarantee lots of fun. The harmonica is not only perfect for ambitious musicians, it‘s also the best choice for beginners. The D major diatonic tuning is the most popular type used with blues harmonicas. It‘s a lot more difficult to play...