Spin charts the 25 "most incredible" rock star body parts in its September issue, now on newsstands. Madonna's navel tops the list.
"It's what first marked her as a mainstream provocateur," senior Spin writer Marc Spitz writes.
At No. 2 is the liver of Rolling Stones' Keith Richards (search), which is so durable, Spitz writes, that "when Richards finally passes, they'll line the exterior of the space shuttle with his liver tissue."
REM singer Michael Stipe's oft-shaved skull comes in third, due to a hairline that's "not too high like Moby's or too low" like Sinead O'Connor's.
Other body parts include Presley's hip-shaking pelvis, Gene Simmons' tongue, Tina Turner's legs, 50 Cent's chest, Bruce Springsteen's butt and Tommy Lee's — well, you know, it's that body part below the waist.