TFW you play a nice wholesome StarCraft community remaster mod, and it hits you with a Half-Life 2 soundtrack...
Not sure how they dealt with the copyright issues, but they seem to have included a lot of music from other games, like Fallout, Half-Life, Halo, Myth, Fable. There's even a Diablo 2 track in there.
it's very easy to deal with. You just hope that nobody cares enough.