So someone suggested keeping daily challenges and I think I have a good way to implement it

I would be the one submitting the initial challenge and whoever in the group manages to get the highest score chooses the song for the next day.
Some stipulations to keep it from being the same people all the time though:

1. If the winner of the days challenge has picked a song for the challenge in the past week the song choice for the next day passes to the person in second then 3rd... etc.
2. If fewer than 8 people participate in the challenge and all of the participants have picked a song in the past week I will choose the next song

I thought it might also be neat to keep a running scoreboard of who has the top score on any of the songs that have been in challenges.

Also send me a pm with a link to a screenshot with your score