Great resource for people interested in learning about copyright infringement, case by case. The site lists well known cases that have occured throughout the twentieth century, including descriptions, analysis and audio. As you might have guessed, many of the post 1985 cases include popular hip-hop songs. Link

Bridgeport Music v. Dimension Films, et al.
aka George Clintion “Get Off Your Ass and Jam” vs. Dimension Films, et al. “100 Miles and Runnin” (NWA)

Newton v. Diamond
aka James W. Newton “Choir” vs. Beastie Boys “Pass The Mic”

Marlon Williams v. Calvin Broadus
aka Marley Marl “The Symphony” vs. Calvin Broadus “Ghetto Symphony” (snoop & friends)