All the music I use is Creative Commons 4 By Attribution, so they're free to use. You can check out the playlist here.You must be registered to see the links
The trailer music has the same soundtrack as Roll Player, I wonder if there is any legal thing there or just the music is free to use?
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A lot of it is from a composer called Alexander Nakarade; here's a look at some of the major ones uses.
For Morningstar I went further, commissioning specific tracks from him. Hopefully I make enough cash on the project to do a full soundtrack for my next project Note that even though I pay for the creation of these, I still release them back into the CC4BY pool like other Nakarade tracks, so anyone else is free to use them as well.