the song you are referring to is a production song and is not commercially available.. shame!
Who Are You by the Who is the theme song for CSI: Crime Scene Investigation.
Kyra Sedgwick
The song is called "The Joker". It is performed by Gina Riley who plays Kim Craig in the show.
the themesong
Steppenwolf - this is who did the song originally.
Lloys Ross
The Dropkick Murphys
Seinfeld finale.
If you're talking about in the TV spot, it's 'Til I Collapse by Eminem.
If you're talking about "The Game" which features Tia Mowry, the wedding song was "I Am For You" Lisa Tucker.
The television series Glee uses 'Time of our Lives' by Rebecca Black as its theme song.
The Fallen