SUMMER TOURS: Thirty Seconds to Mars, John Mayer and David Gray/Ray LaMontagne all announced summer tour plans this morning. The Virgin/EMI Group's Into the Wild tour returns to North America from a successful sold-out stint in Europe, launching April 9 at the Pearl in Las Vegas and coming to L.A.'s Greek Theater May 15. Check their cover of Lady Gaga's "Bad Romance," from a recent appearance on BBC Radio 1’s Live Lounge earlier this week, below. Mayer hits the road on his Battle Studies World Tour, starting July 16 in Charlotte, NC. with a variety of opening acts, including Train, The Avett Brothers and Owl City. Finally, Gray and LaMontagne will hit the road together, starting August 15 in Columbia, MD, with dates at Nikon @ Jones Beach  in Wantagh, N.Y., August 19, and at L.A.'s Greek Theater Sept. 8. (3/31p)