Music

One that I was surprised to learn that I like to share is Grace Jones 'Private Life' was originally by The Pretenders.

Hynde is quoted as saying: Like all the other London punks, I wanted to do reggae, and I wrote "Private Life". When I first heard Grace's version I thought 'Now that's how it's supposed to sound!' In fact it was one of the highpoints of my career - what with Sly and Robbie being the masters, and Grace Jones with her scorching delivery.

Not really a cover but it used such a huge chunk that it pretty much is...

Beyonce "Crazy In Love" is basically The Chi-lites "Are You My Woman"

Twist and Shout is not by the Beatles.

Radiohead is just a Muse cover band

Paint it Black by gob. I think it's funny that I was listening to a relatively small Canadian rock band before I learned about The Rolling Stones.

You're so vain by Faster Pussycat turned out to be a cover

Cross-Eyed Mary

I also thought Man on the Silver Mountain was by Mago de OZ

82nd All The Way - Amaranthe

I love both versions now.

Our Lips Are Sealed is not exactly a GoGo's song. It was co-written with Fun Boy Three.

https://www.youtube.com/watch?v=QhVhK-VVeXo

A twist on the subject for years I thought Guns Of Brixton by The Clash was a cover, but it's an original song.

Jimmy Cliff did an awesome cover though

The entire genre of Drum N Bass is a cover of the Amen break.

@DingoFan I must say I've heard the version of Hurt by Johnny Cash way before I knew it was a nine inch nails cover:

https://www.youtube.com/watch?v=8AHCfZTRGiI

(Here's the version from Nine Inch Nails):

https://www.youtube.com/watch?v=6oGqIfnIAEA

There was also an artist in my country called Lucia. She made a song called Silence which was a cover after a band called The MOOoD. I always thought her song was the original, and not the other way around:

https://www.youtube.com/watch?v=UAm_uoV1z5k

Edit: here's the original:

https://www.youtube.com/watch?v=ZYp7c9sB86c