I like Rdio. I gave the subscription music service high marks when it first launched, for its smooth interface and strong focus on socialization. I had to knock the service, however, for its relatively paltry selection. When I bumped into some folks from the service last week at ces, however, they assured me that they were on top of it, that the company had added plenty of music since I took it for a test drive, and that they were continuing to do so. Apparently the service waited for the ces buzz to die down a bit before making its latest announcement.The Skype founder created service has just added a ton of music to its selection, including such big name indie artists as Arcade Fire, Vampire Weekend, Spoon, The xx, The National, Vampire Weekend, The Pixies, Belle and Sebastian, and Boards of Canada. Also on that list, funnily enough, is country star Tim McGraw. The new selection comes courtesy of a partnership with music licensing firm, Merlin.