Originally Posted by mordwyr

Because there's no way for me to sensibly listen to all the stuff I have and keep getting. I don't put any artist before another because I give all music an equal chance at least on a first listen. Therefore, since all music is equal to me on a first listen, alphabetical is my only option.

Of course, often things pop up in the queue that I've heard before, but that's because they've stayed in my queue because I like them. I still don't want to give old favorites preference over new stuff, or vice versa.