>> a lot of that music, it was space age driven. ♪ i'm bringing sexy back ♪ them other don't know how to act ♪ >> sounds that reflect his own inner ear vision ♪ ♪ it's too late to apologize ♪ it's too late >> timbaland was a little more technologically dense and ethereal, whereas pharrell wasn't as out there. he did like dance tracks. ♪ it's getting hot in here ♪ so take off all your clothes it was a little more gritty. it was very intricate but very rhythmically driven. ♪ all the girls got to be like this ♪ >> pop stars figure out you need hip-hop cred and you need a hip-hop producer. ♪ i ain't no hollaback girl