The Interactive portion of the South by Southwest Music Conference, aka SXSW, ended yesterday (3/15), and turned out to be a fine segue into the Music fest. Throngs of industry professionals, fans and artists are already in the streets of Austin, TX.U2, Madonna, Elton John, Sting and Paul McCartney are among the artists set to perform at the event's flagship show at London's Hyde Park, while the U.S. show, at Philadelphia's Museum of Art, will feature 50 Cent, Dave Matthews Band, Bon Jovi, Stevie Wonder and host Will Smith, among others.