Guest List: Justin Timberlake

From his first solo team-up with The Neptunes to his famous partnership with Timbaland, Justin Timberlake has made hip-hop music a fundamental part of his post-*NSYNC career, and the new millennium's top rappers have welcomed him. They've come through to drop slick guest verses on JT's neo-soul songs, and in return he's graced their trap and funk tracks with his silky-smooth hooks.