sentences:  After a ten-year association, he and Zappa parted company amid litigation in 1976.Zappa claimed that Cohen and his lawyer brother Martin "Mutt" Cohen were profiting unduly from his earnings, and Cohen countersued, claiming that Zappa had taken his album "Zoot Allures" to a rival record label contrary to a contract between them.He also handled Montreux Jazz Festival tours of Japan and the US, and produced the US portion of the in Wembley Stadium upon Mandela's release.