From a purely aural viewpoint, works by Babbitt ("Philomel"), Davidovsky (Synchronisms), Subotnick ("Silver Apples to the Moon"), Boulez (Piano Sonatas), Xenakis (as already discussed), and even Crumb (Vox Balaenae) come to mind. To a listener accumstomed to the three B's, this music can be odd, ugly, or even terrifying. However, each of them has a deep and often extremely musical foundation which a careful listener can appreciate. Babbitt's Philomel is a perfect example - what better music could accompany such a savage story, and the way he concludes the piece seems to suggest her transformation into the bird with almost exquisite beauty (yes - I said beauty!). It takes patience and a cerain willingness to suspend disbelief, but I think all of these works deserve to and can be appreciated.