I have discovered the tip of the iceberg of the culture of people who collect demo sessions, live recordings, obscure remixes and stuffs like that.
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Talk about a culture motivated by pure joy (of finding, having, sharing.) I'm sure like any other ecosystem it has its own particularities including negative aspects (off the top of my head one problem here is that very few of the people involved actually have copyrights to anything they're dealing with) but I get happy when I find something I'm looking for and see responses by people expressing happiness when they find that piece of audio they wanted for-EVER and so on..
Right now what makes demo sessions special to me isn't just that here's another unmastered take of this recording but when the lyrics or song structure is switched up.. sometimes the changes are very significant and are a time capsule for an era; e.g. I got hold of a bunch of early Kanye West stuff a few days ago and that just drove home how although he re-used some of these lyrics later, the original unreleased tracks are in some cases hotter than the album cuts.. and so on