The Guess Who have a lot of really good songs, but somehow I've never pursued them. No albums, not even a greatest hits thing. Basically, by the time I was buying music, I was already into prog, so I have very little straight pop in my collection.
Years later, I heard a radio interview with Burton Cummings and he touched on the breakup of The Guess Who. He talked about how the band was actually starting to get into more complex music. That's the direction they wanted to go. He told a story about how they were doing a song one time that had a 9/8 section, and it just hit him that he didn't want to have to count while he's trying to sing. Songs should be in 4/4, maybe 3/4, but sure as hell not 9/8.
Okay, that's one attitude, and I understand it even if I don't agree. If you're a pop singer with no prog leanings whatsoever, you're not going to want to sing in 9/8 and have to count it out just to know when to sing your part.
The full-length version of "American Woman" has that acoustic shuffle part before the main song starts, which is kinda cool even if it doesn't really add anything. The long version of "No Time" has a few more breaks and solos. "No Sugar Tonight / New Mother Nature" is very clever in how the two songs fit together. I see these all now as examples that The Guess Who were really shooting for something more than basic pop songs. Maybe someday I'll buy a Guess Who album.