Ebony & Ivory-Stevie Wonder & McCartney
Mr.Roboto-Styx
Anything by Celine Deon 
I was in Las Vegas in 2006 and Celine Deon had a show running there.
Anyway, there was a store devoted just to her, sold her albums and all her crap.
The store only played her music.
Can you imagine working there? All day, every day, Celine Deon right in your eardrum.