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I remember trying to put together a rec post a while ago and not finding anything "official" either.

Here's the only comm I found that is not yet deleted and has "songsets" as an interest:

https://30-songset.livejournal.com/profile

They were created in 2006, but I'm pretty sure they were a latecomer and not the beginning.

Their affiliates also look icon-challenge related, maybe you can step through those and find more info?

I remember trying to make a songset in 2004, so I must have seen them around back then.