In my teaching, once a student reaches the Intermediate Level, I use Classical Music (in their original form only) as the "main-stay". I subsidize with Jazz, Pop, Hymns, Rock, etc. but frankly after an intermediate level Jazz tune or Pop, my students really want to return to Classical because it's far easier to predict the rhythm and musical line (phrase). The early elementary students enjoy the little tunes, but once they're past elementary, they appriciate the "structure" of classical music. Of course there's always the 12 year old boy who really wants to work on Boogie and Jazz...great we do it! But for the most part I explain to students Classical is classical because we can depend on it's structure. Then by the time they're in late intermediate and early advanced they love the Inventions and Chopin. In a recent poll of my students they shocked me when I asked each one which piece did they enjoy learning the most and evey single one of them said they loved practicing the Bach Inventions...for their parents they would play Mozart or Chopin and they loved listening to Chopin but the Inventions were the most fun to play.
Hmmm I wonder how much the teacher's attitude influences the student's taste.
Cheers!
Nadia