Yes, it is a lot of listening, but I think it'll work fine. It'll be the fourth such challenge since I became active here--there was the Valentine "happy love song with a twist" February 2016, then the summer "Bare Bones" challenge, and most recently we had the "spooky or something" (I might be remembering the theme of that one slightly wrongly) last autumn. We also had the song of the month every month without fail. It all worked.
If you can't listen to all the entries, just listen to as many as you can. If you listen to them as they are posted, you'll have an idea which ones appeal most to you and you can go back and review only those.
Vicki