12. Changed his stage name to an unpronounceable symbol
The symbol, known as the "love symbol," was adopted in rebellion against his record label, Warner Bros., after they trademarked his name
Michael Jackson
Prince
13. Has the best-selling album of all time
The album in question is Thriller, which has sold 70 million copies.
Michael Jackson
Prince
14. Played guitar
Michael Jackson
Prince
Both
15. Was in a band with his brothers
The Jackson 5 released hits like "ABC" and "I Want You Back" and is how Jackson got his musical career started.
Michael Jackson
Prince
Both
16. Wrote "We Are the World"
Interestingly, there was a part of the song that was meant to be a duet between Jackson and Prince; Prince refused, possibly because he didn't want to sing alongside other famous acts.
Maybe they aren't scientifically, but in common usage they are. Saying something like "Had a pet ape" doesn't have the same ring to it. At any rate, I think it's obvious what the question is asking for.