http://www.apple.com/imac/?watchAd=yes
The music is taken from the song "Exodus Honey" off the album The Day I Turned To Glass by Honeycut. You can listen to the full song on Honeycut's MySpace page.
Off-topic: What a booooooooooooooooooring ad!!
I love Apple ads. They’re the only company that knows how to design products. Whats wrong with designers these days?