A summary of Southern California-related business litigation developments during the past week.

Mothers of Invention Sue Frank Zappa: Six members of the now-defunct rock group, the Mothers of Invention, filed suit in Los Angeles Superior Court on Thursday against the group’s former leader, Frank Zappa; his wife, Gail, and his companies, Bizarre Records, Barking Pumpkin Records, Barfko Swill and Intercontinental Absurdities. The suit is related to one filed in 1985 in which the former members of the band charged that after the group entrusted their business affairs to Zappa, he obtained the master recordings from another record company and profited from them without compensating the band members. In the latest suit, the members add to their claims that Zappa has defamed them by telling a newspaper that the previous lawsuit was “the product of chemically altered imaginations.” A spokesman for Zappa could not be reached. (Filed Jan. 17, 1990. Case No. C749601)