It might sound strange to you, whether you're old or young it doesn't matter (the older ones will get this reference while any kids reading this will be like 'huh, what'?) but as a kid I a) remember watching this (and possibly blocked it out, sort of), and b) confused it with "Disco Duck." Remember that horrible novelty song that somehow became a hit single? It was like the planets aligned and some weird God appeared and said 'Let there be DISCO DUCK, and people will listen to it, briefly, and then torch it and put it in the giant dumpster fire that the rest of disco will go into.' But the point is, for the longest time I actually thought THIS was what people meant when they brought up the song 'Disco Duck' because I never actually heard the song, only this clip-show of songs.
But why am I going on this tangent? Oh, because there's not too much to say here: Disco finally seeped in to the walls of Walt Disney animation studios and, as I suppose any of the remaining Nine Old Men from the classic era were working on The Black Cauldron or Fox and the Hound or whichever, there needed to be something quick and slapped together to appease the (then waning) craze for disco, so this was made. This is a CLIP SHOW, not anything newly animated, and the credited directors somehow include people who had already either retired or died by 1980 (Jack King, Ben Sharpsteen for example) from classic cartoons (it's hard not to recognize Thru the Mirror since it's one of the greatest shorts of all time, nevermind Disney).
In other words, this 10/10 is mostly meant as a kind of ironic rating; this is a trashy little piece of product that was thrown out there for some reason or another, and yet I'm sure it lit up many fans (as it probably did for me) when it was out there with copies of The Black Hole on VHS in the 80's. You can now see it on YouTube in all its cocaine-drenched glory.