Isn't there a difference between selling the rights to use a recording in a program and actually performing a song that is recorded on video? In the case of Square Pegs, there were a couple of important live performances (https://www.yahoo.com/news/get-back-totally-new-wave-legacy-square-pegs-233017396.html) (The Waitresses, Devo, Open 48 Hours), the episodes that didn't seem to have much in the way of actual soundtrack (https://ringostrack.com/en/movie/square-pegs/5193) music. Although The Waitresses' "Christmas Rap" did play in the background of a scene in the Christmas episode.