Photo: FilmMagic

Bonnaroo 2009 is happening — now! Rolling Stone has offered up valuable information about how to get to Tennessee’s monster fest and the best way to get your camping on, plus an hour-by-hour guide to all the essential acts. Now that the rock is underway, get a look at four can’t-miss up-and-coming bands and relive the fest’s best times in a gallery of shots from the first-ever ‘Roo in 2002 to last year’s megafest featuring Kanye West and Metallica.

• Bonnaroo ‘09 Breakouts: Four Bands to Watch

• The Best of Bonnaroo: Radiohead, Metallica, Pearl Jam and More

Keep up with all this weekend’s action at our Bonnaroo hub.