With "American Woman" having been posted about 15 times in this thread, and "These Eyes" almost as many, I'm surprised no one has done this one yet:
"Star Baby" - Guess Who
Really this is the only Guess Who song I still like after all these years. I liked "American Woman" when I was in junior high, but I was over it by the end of high school. But this one has a cool groove to it that still gets my toes tapping.