It almost makes me gag to suggest this, but Alright Now by Free has to be a 'must know'.
As overplayed as it is, it's still a great example of a tastful, restrained and effective playing.
Oh, and Guns n Roses - Sweet Child O' Mine. Many of the same reasons as above, plus a beautiful 'cello' intro and the verses snake their way though the song, all the time playing accents in sync with the drums.