Boilk

"Boilk" is the third track on side one of The Polite Force, 9:15 on Wikipedia and 9:21 in a snippet from Progarchives, credited to Stewart and recorded in May 1970 at Morgan Studios. Progarchives reviewers describe it as musique concrete with tape effects before it turns into conventional prog, a description taken from search snippets. Stewart plays the tone generator on "Long Piece No. 3", not here. No comment from the writer, chart history, video, play count or covers was found.