After much review and analysis, we have concluded that the following musucians/bands should hang it up:
Dave Matthews: We see no need to listen to a pudgy, balding, middle-aged white guy whine insipid lyrics about his "dreamgirl" lifting up her skirt and showing her world to him.
(Editor's note-- we could do that ourselves)
Eric Clapton: The soul is gone.
Red Hot Chili Peppers: While they have perfected hip-hop elevator music (which gives us a certain amount of auditory pleasure), they have been playing the same song ("Dani Californication (Under the Bridge)") for over 10 years.
Eminem & 50 Cent: We sense they no longer have anything to say (though we are worried that "Fiddy" might use this as an excuse to bench-press us).