Sky.fm (under international category) in itunes.
Endless songs and instrumentals that I personally enjoy while I work. It relaxes my mind and helps my focus. Ultimately making me more productive.
Not that other types of music such as rock, rap, pop or country aren't good, they just don't tap into that deeper state of relaxation as new age music can. It has been said that plants thrive with such music and don't do so well with rock music, here are some interesting links: