Here are a few to get things started:
Don Henley’s The Boys of Summer as an 80s synth tune
Bossa nova version of Crowded House’s Don’t Dream It’s Over
Reggae-ish version of Aretha Franklin’s Respect
A capella men’s ensemble version of Lady Gaga’s Bad Romance
Amber Mark’s cover of Heart Shaped Box.
I’m a die hard nirvana fan. I think she took what Kurt wrote and made it totally her own and so, so beautiful.