In my case there are quite a few tracks that, when they come on the system, make me reach for the volume knob and TURN IT UP. This happened today while listening in random play on the headphone system. "Meantime" by Helmet, and I grabbed the knob and head banged like I was 40 again, thrashing in the pit at Mabuhey Gardens. Now I need to get some aspirin, but it sure was a lot of fun to relive that 3 and a half minutes. What tracks do that to you?