The one song per side thing is up for debate; some people say it's effectively a medley, others say it's a saga spanning both sides of the record/tape. Kind of a judgement call -pro-single 40+ min song argument: the opening melody crops up throughout the piece connected by what are reasonably classifiable as bridges, the music only breaks to silence in a few places and the album ends with the same melody & allegro tempo falling back to poco/adagio.
Off the subject, the band said the album was intended to be a musical joke and it is in places. But they also arguably created one of the most wide-ranging, socio-cuturally nuanced lyrical pieces ever.