Carly Rae Jepsen vs Nine Inch Nails - I Really Like A Hole Mashup Duet (bonus Taylor Swift Shake It Off Perfect Drug mashup in comments)
Adam Rifkin stashed this in Mashups!
Update by YepImTheToaster:
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This mashup duet works surprisingly well thanks to YITT.
Call Me Maybe mashup with Head Like a Hole:
Carly Rae Jepsen I Really Like You music video: