I have also been collecting music themed fabric since DH and I are both drummers for a local pipe band. I also love the dramatic black, white and red quilts, and have found several music fabrics that will work well for that look.
If you daughter is into softer colors, your options are more limited, but some do exist.
Applique could also be an option:
http://www.free-quilt-patterns.net/c...ies/Music.html
http://www.quilterswarehouse.com/c-57-music.aspx
http://www.quiltingbookspatternsandn...e.php?id=17580
A straight forward pieced pattern:
http://www.victorianaquiltdesigns.co...lyInclined.htm