We now know when we’ll be able to take in the sights and sounds of Nas, Big Boi, The Roots, House of Pain, and the rest of Rock the Bells 2009. Today, organizers unveiled the dates and venues for this year’s edition, which as we know, will officially get under way on June 27th in Chicago. From the Windy City, Rock the Bells heads east before making a loop up to Canada and ending in the west coast with a stop in San Francisco at the Shoreline Amphitheatre.

In other news, Busta Rhymes, GZA, and The Knux mark the newest additions to this year’s lineup. All in all, Rock the Bells ’09 currently features 31 acts, including:

The Alchemist, Big Boi, Buckshot, Busta Rhymes, Charlie 2na, Common, Damian “Jr. Gong” Marley, Evidence, Eyedea & Abilities, GZA, House of Pain (feat. La Coka Nostra), K’naan, The Knux, KRS-One, Mickey Factz, M.O.P., Murs, Mystic Jouneymen (Sunspot Jonez & Lucky I Am), Nas, Necro, Pete Rock, Psycho Realm, Raekwon, The Roots, RZA, Sage Francis, Slaughterhouse (Joe Budden, Joell Ortiz, Royce Da 5?9?, Crooked I), Slum Village (Baatin, T3 & Elzhi), Supernatural, Tabi Bonney, Tech N9ne

Tickets for this year’s dates will go on sale beginning today via Livenation.com and Ticketmaster.com. Full details are available on guerrillaunion.com.

Rock the Bells 2009 Tour Dates:
06/27 – Tinley Park, IL @ First Midwest Bank Amphitheatre
06/28 – Clarkson, MI @ DTE Energy Music Theatre
07/05 – Toronto, ON @ Molson Amphitheatre
07/12 – Columbia, MD @ Merriweather Post Pavilion
07/18 – Mansfield, MA @ Comcast Center
07/19 – Wantagh, NY @ Nikon at Jones Beach Theater
08/01 – Burnaby, BC @ Deer Lake Park
08/06 – Morrison, CO @ Red Rocks Amphitheatre
08/08 – Devore, CA @ San Manuel Amphitheatre
08/09 – Mountain View, CA @ Shoreline Amphitheatre