Choose the key of the song and your preferred position, and this app will tell you which diatonic harp to pick up, along with where all of the relevant notes are for blues, major or dorian minor songs. Harmonica Key Finder gives you a map of all the notes on the harmonica, including overblows and overbends for any key.This app also supports the non-standard tunings of Natural Minor, Country, Paddy Richter and Melody Maker!