I've been ignoring this thread, but seeing how as it just wasn't going away I thought I'd check it out. It adds a whole new meaning to "But I digress"

How about covers by like names?

Frank Zappa sings Frank Sinatra, I mean who is better qualified to sing "I Did It My Way"?

From the truth is stranger than fiction category, who else has heard the Pat Boone CD where he covers Heavy Metal bands like Led Zeppelin (wasn't there a thread about them a while back?), Metallica, Deep Purple etc? It is a hoot, especially Pat's version of Ozzy Osbourne's "Crazy Train"

I'm not sure if Ozzy was originally an Osbourne Brother of Bluegrass fame. What about Homer and Jetro Tull?