Last week, Dooce posted a few examples of fabulous mash-ups.
"...this one is beyond brilliant and I wish I could favorite it sixteen hundred times, "Mama Said Knock You Out" by LL Cool J remixed with "Come on Eileen" by Dexy's Midnight Runners."
Here are some others that I enjoyed, courtesy of her commenters:
Fleet Foxes and Beyonce:
This is strangely gorgeous.
Michael Jackson and Queen:
Adele and The Rolling Stones: