Pop music, for one, is rubbish, primarily because the people preforming the songs didn't even write them. (If you need proof that it is rubbish, click on this link > http://www.youtube.com/watch?v=T6j4f8cHBIM&ob=av3e ) Pop music tends to be very annoying, repetitive, redundant, and loud. That is why I listen to Classic Rock.
Also, pop is not a genre of music, it is just what's popular. For example, "Live and Let Die" by Paul McCartney and the Wings is listed as pop in my iTunes library.