If you can't find a guitar fabric you like, you might consider one of these patterns from Another by Anita:
Song of the South (treble clef):
http://anotherbyanita.com/shop/patte...-of-the-south/
Unsung Melody (floating staff):
http://anotherbyanita.com/shop/patterns/unsung-melody/
Totally Composed (musical symbols):
http://anotherbyanita.com/shop/new-d...ally-composed/
These are all raw edge applique patterns. My husband is a guitarist, and I made the Song of the South for him. I took the picture before I did the quilting. It is a wall hanging, but could easily be used for the center panel of a lap quilt.
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