The Clash--London Calling...
...but not on my ipod. I heard it on an NBC commercial for the London Summer Olympics.
Now, I don't claim to be a huge Clash fan, or even well versed; they came a little after my golden age of music. But it seems to me that using one of their iconic songs for commercialization would be the antipathy of what they seemed to believe in.
They're also reputed to have shunned profit motivations in the music industry. I wonder how much NBC paid for the rights? Just weird.