 Perry has a theme song tentatively entitled " Perry , " performed by Randy <unk> and Laura Dickinson , and written by Povenmire and Marsh , who write the majority of songs in the series . The song , along with the number " <unk> <unk> Goo " from the episode " <unk> <unk> , " was the first musical composition Povenmire and Marsh pitched to The Walt Disney Company . They were nervous doing so , because , as Povenmire explained , " Disney has a big history of music -- what if they hate it ? " Their reaction , however , was considerably positive and the pair was asked to write a song for each episode , which they vehemently agreed to . The opening lyrics for the song describe Perry as a standard textbook definition of a platypus : " He 's a semi @-@ aquatic egg @-@ laying mammal of action . " 
