So many great titles it's almost impossible to narrow down to just one. But I had to vote Metallica. When I saw the teaser trailer from Stern I got goosebumps. Although certainly not the first rock/music pin, it was the first one that made me think "Holy crap, I never thought ANYONE would do that theme." It kinda opened up the doors to more exciting/risky themes like TWD, Rob Zombie, ACNC, R&M, etc. Also, Metallica is just a great playing game with an awesome Lyman Sheats rule set.