I was playing Second Life for quite a while, and one thing people liked
to do on there was to DJ at music clubs there. I thought that would be fun to do, and I was wondering if anyone makes real-life money doing
that? I also started to think it might be fun to actually DJ in
real-life as well, but I've never been much of one to go to clubs and such, so I don't know how I'd fit in doing that..

I did my stent DJing in a couple of different clubs on SL several years ago. Hardly made any tips, but still had fun.

Started off DJing for parties. Again, no money, but had fun, which at the
time was all that really mattered.
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--- Mystic BBS v1.12 A43 2019/03/03 (Windows/64)
* Origin: Sound Source ]|[ furmenservices.net:2323

But as for DJing, let us know if there's real money... I would assume
it's for Linden dollars, but can they be converted?

Yes, Lindens are freely exchangable with real world money. The exchange rate does fluctuate just like with any other currency exchange.
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--- Mystic BBS v1.12 A43 2019/03/03 (Windows/64)
* Origin: Sound Source ]|[ furmenservices.net:2323