Chillstep : I've found this online collection to be quite relaxing, as the genre name suggests.

The Art Of Noise - The Seduction of Claude Debussy : I hadn't listened to any music by this super-group before this year, and now they're one of my favourite groups...I'm either fickle or these guys are awesome, and I'm not fickle. There's one song I liked in particular, Metaforce, and its remixes. It'll show you just how versatile this group is, with the rest of the album as a backdrop.