I was asked by an eighth grader recently what sort of music I like. I replied that I like Classical music and various kinds of chant and choral work. She said, "Oh that's old stuff, like from the '70s, isn't it?" His Traddiness nearly choked on the air he breathed.
We must remember that we live in a post-Beatles society and almost all music is now saturated with traces of their subversive influence, traces of immature sexuality, rebellion against a now gone social order, and inane rhythm.
As a rule of thumb I avoid most all music that has a bass line and drums, making an exception for some jazz work. I know very little about "metal music" given its relative lack of popularity where I went to high school, but I am more than familiar with "rock n' roll." What an indictment it is that Elton John—a very unique individual to say the least—is by far one of the most "normal" and "talented" in his industry, especially since he has produced such insightful work as "Saturday Night's Alright for Fighting." The Beatles take the cake in my book. Who could possibly top the word "I am the Walrus. I am the milkman. I am the egg man."
Music does not have to be intelligent or complicated to be enjoyable. Indeed a great deal of music is wonderful because of its lack of pretension and its brevity. Even a waltz can be soothing to the ear. Mozart made a career of writing such light music. Mozart also turned out great symphonies (41 being my favorite) and of course his Requiem Mass. While against the use of orchestras at Mass, I will say that his Requiem Mass is actually usable at a real Mass, given the modest length of the Kyrie, Offertory, Sanctus, and Agnus Dei. Beethoven's Missa Solemnis is purely a theatre piece.
Perhaps a cure for the youth would be a prescription to learn an actual instrument other than the guitar. I can think of no greater means of appreciating Bach than playing his work on an organ, nor a greater way of knowing Beethoven than by playing his piano works (that is how I came to love Beethoven). Regardless, the future generations must learn that [good] music predates them by much more than a generation or two.