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bdschafer....
I have been buying up 'music' fabric over the past few months but haven't seen any with piano keys. I just downloaded the pattern a few days ago but haven't had a chance to really look at it.
Maybe someone else will pop in and have info on where fabric could be purchased.
Here's a google search...maybe you'll get lucky and find some for sale.
https://www.google.ca/search?q=music...o0Ae8Q_AUIBigB