By Sean Nelson
Special to MSN Music

Even though the Who famously hoped "I die before I get old," plenty of veteran musicians have managed to stay relevant far past their predicted sell-by dates. Just look at Neil Young, Bob Dylan, Bruce Springsteen, even Elvis Costello and Prince -- still making vital, interesting albums well beyond the age of 50. But what about the ones who don't age gracefully, or who don't know when to quit, who keep pumping out records year after decade? Some people just stay too long at their own party, and MSN Music is here to turn on the lights.

First up: Madonna

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