I was thinking about this last night, and technically, it’s not a 1-1 betting scheme. Once a song is played, that card is removed from the deck, so if you pick a song, at the beginning of the show, it will have a 55-1 chance of being played... but if set 1 is 10 songs long, and you place a bet between sets, then your chances are now 45-1, etc. For each song played that you didn\'t pick, your chances of that song being picked increase exponentially by 1.
just keeping it fair.