Mashups

Have you heard of mashups? It "is a creative work, usually in a form of a song, created by blending two or more pre-recorded songs, typically by superimposing the vocal track of one song seamlessly over the instrumental track of another, changing the tempo and key where necessary."

https://en.wikipedia.org/wiki/Mashup_(music)

Some examples:

Carly Rae Jepsen's "I Really Like You" and Nine Inch Nails' "Head Like a Hole":



Made the latter upset.

https://www.tmz.com/2013/03/10/nine...carly-rae-jepsen-call-me-maybe-mashup-insult/

Taylor Swift's "I Knew You Were Trouble" and Rammstein's "Du Hast":

 

Not exactly a mashup but a combination of Shakira's "Hips Don't Lie" and someone impersonating Danzig:

 

Lady Gaga and Metallica actually had a duet once, but this one's better:

 

ABBA with Van Halen:

 

Daft Punk with the Bee Gees and Justice