Happy Birthday, Kendrick Lamar.
Plus Mike Tyson remembers Hurricane, and Pharrell's new book.
Beatsmith recalls how Chauncey Mahan "stayed effing up."
Earth Day celebration goes bi-coastal with Dipset rhymer.
Plus pics of Lupita Nyong'o, Nicki Minaj, Jay Z and more.
Happy 38th birthday to the trend-setting Harlem rapper.