Prokofiev, Dance of the Knights (Romeo and Juliet op. 64, 1935)

I've been posting a lot of non-metal recently but I think discerning metalheads gravitate to the same patterns: the powerful low brass that sets the rhythm and tone, the strong arpeggio-like melody that starts the piece. Other classical pieces have similar near-universal appeal to metalheads for similar reasons, for example the summer movement of Vivaldi's Four Seasons (covered here after Bach and others).