Who Are You from the Original CSI. It's catchy and strong. But the other two are really good as well. I love The Who.
I think i got to go with Baba O'Riley, i mean the other two are really really good, i'm just a sucker for the keyboard opening.
I have to say Baba O'Riley because it's a personal favourite but in terms of catchiness and popularity everyone knows 'Who Are You' .....
I love the Baba O'Riley one. It's just great. I can just about play it on the guitar. I saw a video of Gary Sinise playing it on the bass guitar, which was just awesome
"Won't Get Fooled Again" really sets the tone for Miami, it's really strong and I love it! Second would be "Who Are You", it really fits the opening credits of Vegas.
Though I'm not one of the regularly watcher of NY I like the NY theme song the most. I'm not sure why. The Miami and LV theme follows right behind.