I used to have a formula for finding good quality songs on youtube: I'd look at the like to dislike ratio, and if it was at least 100:1 then I'd consider that a good ratio. I then found out recently, in the past year or so, that some channels were using bots to generate fake likes on their videos - which blew my formula out of the water.
Instead of looking at the like/dislike ratio to determine the quality, I now look at the views to dislike ratio; if it's 10,000:1 then I consider this a good ratio.. but, the like/dislike button was only introduced in 2011, so earlier videos may have views that won't have incorporated these stats.
Here's an example of a song with a solid ratio:
If anyone knows any other good ones then please post itt.