History

The Evolution of Rap Music in the United States - 1993 essay includes guidelines for teaching about rap music (and graffiti) to middle and high school students. Includes a bibliography and brief lesson plans.
www.yale.edu/ynhti/curriculum/units/1993/4/93.04.04.x.html

The Four Elements - A look at the history of hip hop music. Includes pictures and links.
4elms.straightup.no

Old School Hip Hop - Features biographies, recordings and videos from old school rap artists who performed prior to 1986.
www.oldschoolhiphop.com/