In the “makes me drool” department, the Library of Congress has recently digitized 10,000 public domain recordings from old 78s. So far I’ve listened to “Temptation Rag,” “Little David, Play on Yo’ Harp,” and “I Dreamt I Dwelt In Marble Halls.”
They sound good, although I’m surprised at the level of hiss. I’m not an audio engineer, but I think it could be filtered out. There’s an online tutorial detailing how they made the recordings, but it doesn’t touch on the software side too much.