Finnish cello rockers APOCALYPTICA opened the week long celebration of Metallica's 30th anniversary on Monday (December 5th) at The Fillmore Theatre in San Francisco.Besides their own set, Apocalyptica also joined Metallica on stage for a few songs (check out fan-filmed footage below). After several supports for Metallica (the first one being in Helsinki on November 18th and 19th, 1996) this was the very first time the two bands actually played together. The concert this Monday launched a week l...