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

Musical Theme: Music composer Diane Steinberg filed a copyright infringement lawsuit against TeleAmerica Entertainment, Improv West Inc. and the Arts & Entertainment Cable Network for allegedly using a theme song she composed for the televised comedy show, “An Evening at the Improv,” without crediting her. In the federal lawsuit, Steinberg contends that she wrote the tune, “Improve Strut,” in 1982 and had it copyrighted. She maintains that between 1982 and 1984 the program carried a credit attributing the theme to her, but stopped doing so in 1985. She said the defendants now refuse to credit her with the composition. She is seeking $5 million in damages for breach of contract and other claims. (Case No. 90-6619. Filed Dec. 5, 1990).