    Sentence 1: In what decades was Dudley Simpson most  ective in contributing to Doctor Who?    Sentence 2: Simpson’ firt Doctor Who score was Planet  OF Glants (4964) and he went.on to write music for  many adventures Of the 19605 and 1970s, including  Most OF the stories OF the Jon Pertwee/Tom Baker  Periods, ending with The Homs of Nimon (1979).