In terms of the 20th century, here in the U.S. the tradition was pretty strong: Charles Ives, Henry Cowell, Conlon Nancarrow, Edgar Varese, Harry Partch, John Cage, etc. However, there is also an element of eclecticism which refuses to abandon the pioneering spirit. Folks like Frank Zappa, John Zorn, Sun Ra and others content to span the spectrum of musical styles including those that could be referred to as "experimental". One doesn't listen to that music nearly as much as one ought to, or maybe would like to, but, once it's worked its magic on you the impact is powerful even in occasional, albeit small, doses.
There is no need to expect the average person to know who Nancarrow or Kagel were. And those of us who love their work and are influenced by it maybe do have some genetic or psychological predisposition, even if in this fine nation of ours that may sound like promoting some elitist position. You know, Charles Ives could have just been an insurance man who wrote pretty songs in his spare time. Is there a common motivation behind why he chose not to, and why any of us would be interested in going back to that work when there is so much music being created by mainstream artists in the present? Perhaps Frank Zappa tried to enlighten us when he often stated that there will always be "freaks", and there might never be a completely satisfactory scientific explanation.
To me, the universality of all music, lies in that it is available to anyone who wishes to venture into its world. Those that don't want to enter the universe of unusual sound making can no doubt still live wonderful lives. But some of us can't, or at least don't seem to want to...
