Ok, so I'm surprised at the lack of talk about bootlegging here. For those who don't know, bootlegs are basically unofficial recordings circulated around music communities such as audience recordings, soundboard recordings, pro-sho or audience shot video that wasn't officially released. Also, bootlegging is not piracy. Piracy is distributing things that cost money for free, whereas bootlegging is distributing things that aren't for sale. I actually found a record store that sells bootlegs :V. Anyways, here are some of my bootleg suggestions.
Listen to this eddie - Led Zeppelin
For Badgeholders Only - Led Zeppelin
Berlin Germany 1980 (Last ever Led Zeppelin show with John Bonham)
I personally love bootlegs because, after you've exhausted all the bands officially material, where else can you go? Bootlegs, that's where. I love old bootlegs, 8mm film recordings. It's amazing how good quality stuff people got back then. Of course, one of my favorite things, someone managed to capture the time in 1977 Keith Moon from The Who came on stage with Led Zeppelin. Thank god someone got that (And the entire show this video is from is also the same show as Badgeholders above)