A ton folk music is written for instruments in the key of C, like fiddles and pianos. So many instruments are in other keys - like Clarinet and Trumpet are in the key of Bb, and French Horn is in the key of F. This tool I made makes it possible to transpose folk tunes on the fly to be playable by non-C instruments. It reads in music via “ABC” notation, which you can find on folk tune sites like

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