Yes it is, or even if you're just a classical music fan who likes to listen while following along with the score.
I contribute $2 USD a month to Petrucci/IMSLP for the same reason I contribute $3 a month to Wikipedia and $11 a month to WNYC: for the greater good of human civilization.
I contribute $2 USD a month to Petrucci/IMSLP for the same reason I contribute $3 a month to Wikipedia and $11 a month to WNYC: for the greater good of human civilization.