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most renaissance and baroque works for plucked instruments (lutes, baroque guitars) were originally notated in tablature and such scores can certainly be found at IMSLP. If you think "guitar tabs" are a recent invention you're quite wrong.

https://imslp.org/wiki/Category:For_guitar

Honestly, this sounds like a great idea. Project Gutenberg for tabs in the public domain.

This sort of exists already at https://classtab.org/

There's also https://www.classclef.com/ which appears to be a tidier fork of the above

Wow!! Thank you!! I play by ear but have a bunch of friends who will love this.