The Kelly Clarkson thing was not at the opening or closing ceremonies, it was an outdoor concert they showed during the Olympics broadcast towards the end one night when they were showing medal ceremonies.
By the way for anyone who wants another example of the teen market's takeover of the music industry, the Jonas Brothers are on the cover of Rolling Stone. The Rolling Stone cover doesn't mean what it used to, what with them putting the girls from The Hills on it
but it says a lot about who the industry thinks is buying magazines and music that the Jonas Brothers got the cover. It's not about the quality of their music, because no one thinks any of these teen acts are making timeless music. It's that they're the ones who're selling now.