I wanted to make a piano bag for my son, who had just started taking lessons. He had four books and at five years old, desperately needed a bag to carry them all. This green material was the bottom part of an old curtain I probably got at a yard sale several years ago. My husband's family is doing their best to prejudice EJ against anything orange and blue (it's a football thing), but honestly I was just looking for material that I had already that would match; and this orange went nicely with the green.
First, I measured how wide the piano books were with the four books stacked on top of my hymnal. This material is from the top of a sheet we got, guess where?, the thrift store.