Quatrain appears on HBO series Mrs. Fletcher
It may look like any other quartet gig, but the video bars at the bottom give it away.
The title character of HBO's Mrs. Fletcher works in a senior living center, where the quartet appears briefly in a scene, singing "I Want A Girl (Just Like The Girl That Married Dear Old Dad)" -- perhaps a wry commentary on the life of the protagonist?
(Warning: series contains nudity and sexual content.) (The quartet sequence does not.)