The Rolling Stones played a "surprise" gig for fans in Los Angeles on Saturday (April 27), a week ahead of kicking off a U.S. tour to mark 50 years in the music business.<br/> <br />Hundreds of fans, alerted on the band's Twitter account, lined up from as early as 5 a.m. on Saturday to get hold of the $20 dollar tickets for the concert at the 320 person capacity Echoplex club in Los Angeles.<br/> <br />Tickets were distributed by a lottery system and sold out quickly.<br/> <br />The veteran British rockers will officially launch a 17-date North American "50 and Counting" tour on May 3 in Los Angeles, after playing a handful of dates in London, Paris and New York at the end of 2012.<br/> <br />Tickets for the opening concert at the Staples Center arena in Los Angeles went on general sale on April 15 and were still available on Saturday at prices up to $600 each.
