Music Meta-Data - If It's Missing, Does It Exist?

"The back of the original CD, and the LP, lists personnel. There is studio information and other details. On other releases there might be liner notes or additional images. This material is what I fed on as a young listener, and I’m still hungry for it today. Much of it disappears when I rip a disc to my hard drive, and online services generally don’t fill the gaps. Sure, background is available to varying degrees in a constellation of mutually supportive and competitive complementar