Summertime: Which is superior?

[DeathsHand]

Originally Posted by GameMaster

Question: What criteria did you use to narrow a song that's estimated to have been covered 2,600 times down to 15 artists?

They were the first 15 I located on youtube, and unfortunately the forum does not allow anymore than 15 choices per poll.
I'm considering posting the others (in groups of 15, of course) as I find them so that they all have a shot to be judged fairly as either superior or inferior to their peers.