Songs that would be fucking awesome as lounge songs or operatic pieces:
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"My Name is Jonas" - Weezer
Think of it: "MAAAAAAAAAAAAAAAH NAAAAAAAAAAAAAAAAAAME IS JONAAAAAAAAAAAAAAAS!" It would rule.
Madama Butterfly by Giacomo Puccini. Oh wait, that's an opera that would make a great rock song.
I think the entire Bat Out Of Hell album would make an awesome opera.
Richard Cheese did a lounge cover of Closer that was just submlime.

"One" by Metallica.