If she "cheated you out of 15 euros," that's shitty and I can understand how you feel. BTW, I also play harmonicas, including a chromatic harp, and I'm even part of a 3-member band. I don't feel I have to post YouTube vids to prove anything. Incidentally, you don't need to play an instrument to know if a song is played correctly or not; all you need is a good ear -- and, believe me, you don't know how to play "Rainbow" -- which is interesting because you play blues so well.