This is one of the best musical line-ups I've seen in a long time -- and it's in Denver. Well, Commerce City, but close enough. The dates are July 19 and 20. The location will be the soccer field outside Dick's Sporting Goods Park in Commerce City. The cost: $150 for two-day passes. Tickets go on sale March 29 through TicketHorse, and March 20 for KBCO Interactive members. The headliners are Tom Petty and the Heartbreakers and the Dave Matthews Band. Here's the full lineup: The lineup for July 19: Tom Petty and the Heartbreakers, Steve Winwood, Michael Franti and Spearhead, O.A.R. (Of A Revolution), Spoon, moe., Citizen Cope, Brett Dennen, Newton Faulkner, Andrew Bird, Josh Ritter, State Radio, JJ Grey & Mofro, Bob Schneider, Meese, Born in the Flood, Railbenders. The lineup for Sunday, July 20: Dave Matthews Band, John Mayer, The Black Crowes, Rodrigo y Gabriela, Colbie Caillat, Ingrid Michaelson, OneRepublic, Flogging Molly, The Roots, Leftover Salmon, Martin Sexton, Flobots, Grace Potter & The Nocturnals, Tea Leaf Green, Rose Hill Drive, The New Mastersounds, Serena Ryder, The Photo Atlas. For more, check out the Mile High Musical Festival's website here.