http://www.hitpredictor.com let’s you rate songs and artist for points. Your goal is to get as many points as you can in order to get CD, DVDs, or even gift cards. The only downside to Hitpredictor is the fact that it takes a while to build your points. I don’t use this one, but I did try it out. They don’t have good items for the amount of points they have you pay for them.
www.research.fm rewards you with Amazon gift cards. Their system is invite only, but once you get invited they have you to take a music survey after you rate and listen to a song.
http://www.musicresearch.com has you to rate music to win prizes in their monthly drawings. This is sort of like Hitpredictor and Research.fm.
http://www.slicethepie.com is another music site that will pay you money to listen to songs. They cater to people who wants to listen to up and coming artists. They have you to listen to their song and review and rate it. Your review has to have key words relating to the song in order for them to accept it though. The price they pay you ranges from how detailed and long your review is.
These are only a couple of ways to make a little cash on the side when you don’t want to work hard for it. Just remember that these websites won’t make you rich.