Besides Roundabout, Going For the One is the definitive introductory Yes song
My opinion, of course. But for me, Yes is one of those Prog rock bands that no matter how experimental they get, always maintain those twangy rock ‘n’ roll influences in their sound.
Roundabout, aside from lots of people even out side of prog listeners having some sort of exposure to it, does a great job at illustrating what yes is all about: rock and roll, pushing the compositional envelope, and synthesizers.
I feel Going For the One also does this very well in an easier to digest format. The song for the most part is kind of just a rocking ditty, it’s got a nice rocking rhythm section with twangy guitars and this guy with a high voice sort of yell singing. But I feel the song slides in those proggy elements a lot more subtly and gradually. I was going to write a whole analysis of how they achieve this differently than on roundabout. But I’m too lazy :p