What songs do you think demonstrate a specific musical concept so well that they should be used in conjunction with teaching that concept? (a song which really features a particular chord progression or turn around, or a song which really demonstrates a certain type of song writing format)

For example: The jazz standard, "All The Things You are" prominantly features the (vi - ii - V - I - IV ) chord progression throughout the song. The song also features a common jazz turn around (I - ii - iii - vi7) toward the end of the song which I've seen in many other songs.