A week ago i found a album of RyuRyu that really amazed me.
The songs in that album Homeland are sung by Miku Hatsune, a Vocaloid, and the songs are sooo soothing! They help me a lot remaining calm when i draw or study :D
My two favourites of that album atm are:
Tachycardia: http://www.youtube.com/watch?v=UZqMF_sCfVI
and
Journey: http://www.youtube.com/watch?v=AqvYahL9j8Y&feature=related
the cover is pretty amazing too! :)