This one really is a feast. It’s a history lesson with an immaculate soundtrack and it is about so much more than disco.

Disco: Soundtrack of a Revolution emphasizes the beats and songs that built a classic sound, and the communities, often marginalized or under-represented, who did the hard work – and all of the dancing! – to bring it to life by the light of a turning glitterball, before the music ever went slick and mainstream.

Not every artist is covered or great song heard. But “Soundtrack” hits all the important points over its three hours, cogently presented and mostly a lot of fun — a mutually illuminating mix of anecdotal reminiscence, musical analysis, historical accounting and political theory.

The final segment, about disco’s huge cultural impact, rather peters out, but no matter. There’s still much to enjoy in this spangled homage to anarchy on the dancefloor.