Yesterday I made a pretty surprising discovery regarding one of the show's background music tracks! The disco theme that was heard in such episodes as "Flaw and Order," "Strangers on a Train," "Buster the Lounge Lizard," "Through the Looking Glasses," "Sue Ellen and the Last Page" and of course "Mr. Ratburn and the Special Someone" is actually a stock music track that came from the Intervox Production Music library!
The track in question is "Mojito Sounds Better" by Micky Wolf from Germany. The album here is copyrighted 2010, but I'm pretty sure this track was originally on an earlier album, maybe even recorded back in the 1970s when disco was relevant?
Of course, using library stock music on "Arthur" is nothing new; the early seasons used
some Sound Ideas stock music tracks (mostly from the Series 4000 "Hollywood" sound effects library), as this was before Ray Fabi's library of compositions for the show really grew.
Yeah, I know, I didn't use any screencaps from those episodes I mentioned, because I always thought that music track was what Arthur's parents were probably dancing to in that old photo of them disco-dancing from "Arthur's Eyes".