"El Matador" by Los Fabulosos Cadillacs. For me this song has everything. Structure-wise it has a perfect arrangement of mellower parts flowing into anthemic parts and creates an incredible amount of tension and build. And it has those great vocals that make you want to shout along but that also have a little undercurrent of sadness too. Plus it has a beat that just makes you want to shake your ass and one of the most killer basslines ever. But most of all it has such
power, it's like an elephant crashing through a city. I've seen it live too and I have to say I have never seen a song make a crowd move the way this one does.
Unfortunately YouTube has disabled the embedding on this one but you can still check it out if you click this link:
YouTube - LOS FABULOSOS CADILLACS - Matador