What Makes a Song Sad?

 The popular belief is that, "at least for Western music, songs written in a major key (like "Happy Birthday") are generally upbeat, while those in a minor key (think of The Beatles' "Eleanor Rigby") tend towards the doleful." -- What Makes a Song Sad

STTA. An interesting sidebar to this piece in The Atlantic lists songs that make folks cry. Take a look and see if you agree -- or, better yet, list some of your own favorite sad songs, and tell us what makes them so special.