This August 4 will see the kick-off a month-long tour for System of a Down and Mars Volta. Opening for the two bands will be Bad Acid Trip. SOAD’s Mezmerize, released last month, has already sold over 800,000 copies. The Mars Volta’s latest release, Frances the Mute, is the band’s most successful work, having sold almost 350,000.http://www.billboard.com/bb/daily/article_display.jsp?vnu_content_id=1000963002