Einstein rocked the world of physics with the theory of relativity. Now its time to use relativity to rock the music world.
If you rate your music by giving it a fixed value as a rating (such as 9/10), you run into some problems. You may sit there trying to figure out which rating to give, i.e. is it a 8/10 or a 9/10. Also, if you have 1000 songs rated as 9/10, and you want to decide what to listen to, how helpful is the rating? And if the quality of music changes over the years, you may go back and find that all of the 8/10s you gave recently are better than the 8/10s you gave years ago, or vice-versa.
The solution is to abandon the approach of giving a rating a fixed value, and instead rate songs based on relative quality to other songs. It may be hard to figure out whether to give a song an 8/10 or 9/10, but it is very easy to figure out of the song you are listening to is better, worse, or about the same quality as the song you just listened to. In time, after rating songs in this fashion, the good songs will rise to the top. You won't have to worry about deciding which of 1000 songs rated 9/10 are better. You don't have to worry about your ratings drifting over time.