Because you horrid people only reply to lists.
Here's the deal. Think of a band. Now consider two songs.
1) their most REPRESENTATIVE song.
2) their BEST song.
Representative = if you had only one song to introduce an alien to this band, what would you play them?
BEST = if you had one song to represent the essence of their greatness...for any band..what would you choose?
Here are some examples.
Most REPRESENTATIVE SONG: Stairway to Heaven.
Helped by being long. Encompasses the acoustic and heavy sides of the band. Has the hippie-dippie stoned lyrics, and the rock n roll bad ass lyrics. It's the band in one song.
BEST SONG: Going to California.
Most Representative Song: (Don't go back to) Rockville
Best Song: Orange Crush
Most Rep Song: Where The Streets Have No Name
Best Song: One
Most Rep Song: Thunder Road (or some other 70s anthem)
Best Song: (Streets of) Philadelphia