Now this is our idea of innovative competition. MetroPCS is partnering with Rhapsody to add another "unlimited" to its all-you-can-eat plan: music. Rather than being charged a monthly subscription charge to receive access to the service's massive catalog of 12 million tunes, customers will get the same service -- that's playing, streaming, and even downloading tracks -- without any additional charge on their monthly plan. So far, the service is only available for the carrier's Android lineup, so head on over to the Market to download the app. Before you begin downloading music left and right, however,