the book is called: Deluxe Concertina Book by Frank J. Converse, Mel bay.
the song is called concertina concerto, its on page 50, if you have the book.
from what i understand, mozart made alot of concertos. I just want to get an idea of what the song sounds like on youtube. (before remapping it out and learning it.)
I can post a picture of the piece, but I don't know how copy right laws and fair usage laws work.