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
Postmodern Jukebox ft. Haley Reinhart - Creep (original by Radiohead), jazz/big band style
Novena - Bury a Friend, progressive metal Billie Eilish. Starts out like the original and gets progressively heavier.
Surprised how far down I had to look for Postmodern Jukebox to show up!
So many of the Postmodern Jukebox covers are fantastic.
Time, the Valuator covered Lovely as well. Pretty fucking amazing.