Hey I'm new to this site (As of yesterday) and holy CRAP you guys argue a lot rofl. But I'll insert my 2 cents...
I've been singing all my life, I failed music theory in highschool, and I make beat after beat with great chord changes, I've done orchestrals, rap beats, pop beats... Just check my soundclick.
POINT: I play no instrument, can't play they keyboard, and a lot of my best beats were by using acid (i used drum, hi hat, snare in 3 channels for beats and piano roll for melodies, etc).
Timbaland was a DJ, he knows what good music is, he has crazy music taste, he didn't have to be a band class nerd to learn how to make a good song.
P.S. I think it's hilarious how everyone busts out Dre, Neptunes, and Timbaland to support your beliefs.
P.S.S. Welcome me :-D