Question: Which two Rock band's legal representative also represented the kidnapped grandaughter of American publishing magnate William Randolph Hearst?
Sentence (from "William Coblentz (attorney)"): William Kraemer Coblentz [KAHB-lenz] (July 28, 1922 – September 13, 2010) was an American attorney and behind-the-scenes power broker who played an important role in California politics in the years after World War II, serving as a Regent of the University of California and legal representative for the rock bands Jefferson Airplane and the Grateful Dead, as well as for socialite, kidnapping victim and convicted bank robber Patty Hearst.
Relevant evidence: Yes