I've got a lot of rare stuff downloaded from Soulseek back in the day that I expect I'll never be able to find again. One of my most spine-tingling tracks is a performance of "Flowers Die" by The Only Ones, far better than the one that made it into their rarities compilation, where a bit of feedback chirps serendipitously right after the line "There's a rustling behind me". You wouldn't even know it's a concert bootleg without the audience applauding at the end.

I realize this sort of contradicts my other comment, but I want to believe I didn't spend all those years as a music geek for nothing!