I think part of the problem with "keys" and particular songs is with the autoharp itself. To my ear, there are some songs that simply want to be in a particular key on the autoharp......I guess cuz you can find all the notes you want....and harmonies and bass rythyms in a specific song. I think the guitar and some other stringed instruments are much more versatile....maybe?? Curious to know if other harp players would agree??