Soundtrack albums have always been something of a problem - either they stick closely to the movie (as they originally did), presenting a lot of music that makes no sense outside the context of the movie, or (as generally happens now) they gather together a collection of music that has little connection with the movie, except that bits of each song can be heard in the background of the movie. Occasionally, an old style soundtrack (such as West Side Story) had enough great music to sell in huge quantities, but such soundtracks were the exception. The Saturday night fever soundtrack marked the beginning of the shift to a more popular form of soundtrack album, although there are some weak tracks here.
The Bee Gees wrote most of the music for this album and recorded some of it themselves. They gave More than a woman to Tavares although their own version of the song also appears on the album. They gave If I can't have you to Yvonne Elliman although they had already released their own version of the song as the B-side to one of their hits. They also included a couple of their own oldies (Jive talking, You should be dancing) on the soundtrack, but the most important tracks here are the first three tracks - Staying alive, How deep in your love and Night fever - all of which were huge hits around the world although they were bigger hits in America than anywhere else. Of the other tracks, Boogie shoes (KC and the sunshine band), Disco inferno (Trammps) and Open sesame (Kool and the gang) are the best.
Those classic tracks can, of course, be found elsewhere. You would that an appearance on a successful album like this would make stars of the contributors that weren't already stars, but David Shire (for example) disappeared as quickly as he came.
If you only want the best songs, you may prefer to buy them by the individual artists, beginning with a Bee Gees compilation (there are plenty to choose from) but despite some weak tracks, this album is the soundtrack of an era.