Some of you may be interested in this. I found it looking for a score of the Bach B-minor Mass (so tempted to be pedantic and call it the H-moll Messe, but watch as I resist the urge mightily). It's a collection of classical music scores that have fallen into the public domain.
The closer to present the composer lived, the patchier the collection--though there remains a refreshing amount of Prokofiev.
Anyway, I'm going to go for a lurch.