I'm not sure PMU is definitely that song for them. There are so many that could be considered fan-favorites. Why PMU, and not Metropolis, TSCO, 8vm, TCoT, etc...? Heck, even Panic Attack, since it was in Guitar Hero, has probably become one of their most beloved songs, especially among younger fans. PMU was the one "hit" but it wasn't even that big of a hit, and is ancient history. Plus, to be quite honest, it's never been a great live song, at least as far as I'm concerned. Even listening to the latest Lost Not Forgotten release, live in NYC '93, I feel like it just didn't work that well, even with 20-something year old James.