flip-flops Dec. 6, 2012 Metallica, Sworn Enemy of Music-Sharing Technology, Finally Joins Spotify By Zach Dionne SAN FRANCISCO, CA - DECEMBER 9: James Hetfield (L) and Robert Trujillo of Metallica perform during day three of the band’s 30th Anniversary shows at The Fillmore on December 9, 2011 in San Francisco, California. (Photo by Tim Mosenfelder/WireImage) Photo: Chris Weeks/2010 Getty Images Sources Reuters Billboard Tags: metallica spotify flip-flops music Music-Sharing Enemy Metallica Joins Spotify