A series of lectures exploring hip hop culture and its legacy kicks off with a talk by Bakari Kitwana, author of “The Hip-Hop Generation,” executive director of Rap Sessions and co-founder of the National Hip-Hop Political Convention. The Hip Hop Lecture Series celebrates the 25th anniversary of Professor of Africana Studies Tricia Rose’s award-winning book “Black Noise: Rap Music and Black Culture in Contemporary America.” Room 130, Institute at Brown for Environment and Society, 85 Waterman Street.