Originally Posted by Forward To Death

Well impact on music is something that's tangible that you can make an argument for pretty easily. There are statistics on that type of thing, while you absolutely will not be able to find the same things when explaining actual quality.

Basically, it's a safer argument to say that popular=better. It's inaccurate, because there's not rational basis for popularity impacting music taste, yet it's obvious that a lot of people do listen to music for the sake of popularity. Because of this, your argument is going to ring true to more people than if you explained in detail why "Master Of Puppets" is better than "Louie Louie".