I’m sure we’ve done this before, but hey I’m listening to Daisies of the Galaxy and enjoying Mr E’s Beautiful Blues, released as the first single natch. It was recorded after the album was finalised. Record company and E agreed on a compromise with it as an unlisted track at the end (my copy has a somewhat hopeful record company sticker on the front advertising its presence, presumably baffling to the casual buyer as on turning over to the track listings it is nowhere to be found). So, your best hidden tracks. Hidden means not listed on the cover or the record, so not apparent to the browser. And this was of course around long before CD’s as another favourite is…in the comments. Please don’t post that Ash track of them all being sick.
https://www.youtube.com/watch?v=WiZ0eBDnLdU