Last night, when Gerry Rafferty's Baker Street came on the radio, I realized that the actual hook of the song is not sung, but played by an instrument. When the verses are over you'd expect a chorus with lyrics by the singer, maybe even backup singers, but no such thing - a single instrument takes over and gives the song its catchy hook. And of course, in this case, it's that saxophone that gave the song its distinct feel, made it instantly recognizable and gave it its well-deserved place in history. Come to think of it, I don't believe there are many hit songs (or album tracks for that matter) that work this way. The only other example I could think of is Private investigations by Dire Straits, where Mark Knopfler mumbles the verses and that acoustic guitar adds a hook. I'm sure forum members can come up with more examples.