You guys, this is kind of awesome.
Rap Genius is a site that's been around for a while. Basically, rap and hip hop lyrics are posted, and users can add their interpretation of the lyrics. You can put in other audio, video, photos, anything. And you can comment on someone else's interpretation, and start an awesome conversation about the music you love. All you have to do is click on a line of lyrics, and fall into the hole. (Like here, if you click on the intro to this Kendrick Lamar song, you can watch Dr. King's speech that inspired it!)
What is REALLY cool is sometimes you'll get a surprise. I guess Rap Genius was so popular it spawned sister sites for Rock, Poetry/Prose and Sports. Someone posted a passage from one of Cambridge's own Junot Diaz's books, and he hopped on and got in on the conversation! So cool.
Something to bookmark for a rainy-avoiding-homework day.