For twelve heavy metal tracks, you'll want the Armoury Records Sampler.
For Beyonce, Solange, Trin-i-tee 5:7, Chaka Kahn, and other gospel tunes, you'll want the Essence Festival Sampler.
If you like Antony and the Johnsons, you'll want to hop over to download "Thank You For Your Love."
If you're mad at me for not finding more straight "rock" downloads, you'll want to give "Turn It On" by Default a listen.
If the picture aptly describes you, you'll definitely want to download the First To Hear playlist. (My favorite is "Undertow" from Warpaint)
If you want to buy the shirt, check out Threadless.