MySpace Music added a few hundred thousand songs to its streaming music service today by signing up four more independent-label aggregators (Nettwerk Music Group, INgrooves, IRIS Distribution, and RoyaltyShare) plus indie label Wind-up Records. This comes at a time when Facebook is still facing hurdles to launching its own music service.

MySpace Music launched with all the major labels, and was initially criticized for not having enough indie music despite launching the Orchard, the top indie music aggregator. It then followed up with IODA in October (Which represents 6,000 indie labels), and now this set of deals brings the total number of indie tracks on MySpace Music to 4 million.

Some of the artists covered under the latest deal include KRS-One, Marvin Gaye, Lou Reed, Modest Mouse, Creed, Dolly Parton, and Thievery Corporation.