The Bay City Rollers have always sufferred from a bad reputation (among those that have never heard their music). So it comes as some surprise to hear just how great they were. It is just an injection of the purest pop you will ever hear. Don't try to analyse the lyrics, just go with the flow, and pretty soon you will be up out of the chair chanting S-A-T-U-R-D-A-Y Night, Shang-a-lang, bye bye baby, and all the rest of their classics. The music is as fresh today as the day it was recorded. If you are a fan, or just curious to hear what the "worst band of all time" sounded like, this is the place to start.
(and Saturday Night was released in the UK, before Les joined the band and wasn't a hit, but was re-recorded, with Les, soon after for their debut album. And it was this version that got to US number one a few years later).