Hip hop materials are spread throughout the library departments, so this topic was not well covered on November 11 when we focused only on Special Collections.
Materials on hip hop culture are actually spread across several library departments:
Cornell University has an outstanding Hip Hop collection. Two sections are online:
The NOLA Hip Hop and Bounce Archive is at the Amistad Research Center at Tulane University. They have video interviews with leading hip hop and bounce artists.
The Hip Hop Archive at Harvard is mostly not online, but they do provide a great bibliography of books and articles on hip hop.
University of Houston Libraries, Houston Hip Hop Archive. Open the menu under Digital Library Collections.