During his military service, Alex he met Hanoch Levin for the first time, and after the Six Day War, both staged the satirical cabaret “You and I and the Next War” which caused a public scandal. Kagan continued to collaborate with Levin and composed music for 8 more plays. Kagan wrote music for about 30 plays with the best playwrights and directors in Israel and abroad. He also wrote music for television and cinema. In 1982, Alex Kagan was invited to Germany with the play “Yaacobi and Leidental” and stayed there for a long time. In Germany, Kagan was engaged in composing music for theaters, musical management, directing cabarets, theater, and opera in theaters in Dusseldorf, Stuttgart, Nuremberg, etc. From time to time, he returned to Israel and directed special productions with a special combination of opera and cinema: “Le Villi” by Puccini, Anne Frank, Lieders by Schubert, Mahler and more.