Question: Which two Rock band's legal representative also represented the kidnapped grandaughter of American publishing magnate William Randolph Hearst?

Context articles: William Randolph Hearst Jr.
Patty Hearst
Phoebe Hearst Cooke
William Coblentz (attorney)
Hearst Castle
Screenplay for Citizen Kane
Patricia Lake
William Randolph Hearst II
William Randolph Hearst Memorial State Beach
Sources for Citizen Kane

William Randolph Hearst Jr. (January 27, 1908 – May 14, 1993) was an American businessman and newspaper publisher.
 He was the second son of the publisher William Randolph Hearst.
 He became editor-in-chief of Hearst Newspapers after the death of his father in 1951.
 He won a Pulitzer Prize for his interview with Soviet premier, Nikita Khrushchev, and associated commentaries in 1955.
Patricia Campbell "Patty" Hearst (born February 20, 1954), now known as Patricia Hearst Shaw, is the granddaughter of American publishing magnate William Randolph Hearst.
 She became nationally known for events following her 1974 kidnapping while she was a 19-year-old student living in Berkeley, California.
 Hearst was abducted by a small left-wing terrorist group with only 20 members known as the Symbionese Liberation Army.
 After being isolated and threatened with death, she became supportive of their cause, making propaganda announcements for them and taking part in illegal activities.
Phoebe Millicent Hearst Cooke (July 13, 1927 – November 18, 2012) was an American businesswoman and philanthropist.
 She served on the board of directors of the Hearst Corporation from 1962 to 1998.
 She was a granddaughter of William Randolph Hearst.
 Her twin brother was former Hearst Corporation chairman George Randolph Hearst, Jr., who died in June 2012.
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.
Hearst Castle is a National Historic Landmark and California Historical Landmark mansion located on the Central Coast of California, United States.
 It was designed by architect Julia Morgan, between 1919 and 1947, as a residence for newspaper magnate William Randolph Hearst, who died in 1951.
 In 1954 it became a California State Park.
 The site was opened to visitors in 1958.
 Since that time it has been operated as the Hearst San Simeon State Historical Monument where the estate, and its considerable collection of art and antiques, is open for public tours.
 Despite its location far from any urban center, the site attracts "millions of travelers each year".
The authorship of the screenplay for "Citizen Kane", the 1941 American motion picture that marked the feature film debut of Orson Welles, has been one of the film's long-standing controversies.
 With a story spanning 60 years, the quasi-biographical film examines the life and legacy of Charles Foster Kane, played by Welles, a fictional character based in part upon the American newspaper magnate William Randolph Hearst and Chicago tycoons Samuel Insull and Harold McCormick.
 A rich incorporation of the experiences and knowledge of its authors, the film earned an Academy Award for Best Writing (Original Screenplay) for Herman J. Mankiewicz and Welles.
Patricia Van Cleeve Lake (between 1919 and 1923 – October 3, 1993), known as Patricia Lake, was an American socialite, actress, and radio comedian.
 She was long suspected of being the illegitimate daughter of actress Marion Davies and publishing magnate William Randolph Hearst, which she herself admitted shortly before she died.
William Randolph Hearst II (born 1942) is one of John Randolph Hearst's sons.
 Within the family, he is often referred to as Billy.
 He attended the University of San Francisco and married Jennifer Gooch; they had a son, Jason Hearst.
 William and Jennifer divorced, and Jennifer married Andrew Rowe, Jr.; she died in 2008.
William Randolph Hearst Memorial State Beach is located near the historic town of San Simeon along California State Route 1, in San Luis Obispo County, California, United States.
 It is named for newspaper magnate William Randolph Hearst (1863–1951), whose family is closely associated with the area.
The sources for "Citizen Kane", the 1941 American motion picture that marked the feature film debut of Orson Welles, have been the subject of speculation and controversy since the project's inception.
 With a story spanning 60 years, the quasi-biographical film examines the life and legacy of Charles Foster Kane, played by Welles, a fictional character based in part upon the American newspaper magnate William Randolph Hearst and Chicago tycoons Samuel Insull and Harold McCormick.
 A rich incorporation of the experiences and knowledge of its authors, the film earned an Academy Award for Best Writing (Original Screenplay) for Herman J. Mankiewicz and Welles.