I've been playing so many soundtracks for my background music at work. Of course, nostalgia makes some songs slap harder than they deserve to, so your results may vary, but some of my favorites have been:

Mega Man series

Warcraft (I'm especially fond of Warcraft 2 songs)

Donkey Kong Country series

Variety lists (one hit wonders from games you nearly forgot)

Spotify has a lot of video game playlists, and even some covers in different styles. Right now we're listening to metal versions of classic games.