Simplify the following text for a Grade 7 native English-speaking person.
Original: He worked extensively in radio drama ( most notably for Orson Welles ) , composed the scores for several fantasy films by Ray Harryhausen , and many TV programs including most notably Rod Serling 's The Twilight Zone and Have Gunâ `` Will Travel .
Simplified: He also wrote music for radio drama including works for Orson Welles . He wrote for several fantasy movies by Ray Harryhausen , and many TV programs .