The death of composer Gyorgy Ligeti earlier today seems to have shaken the Classical Community to the core. Viewed as one of the 20th Century's Greats, he had half a century of compositions behind him, of which the Symphonic Poem for 100 Metronomes seems the most curious and experimental. Then there is also Lux Aeterna, of 2001 fame, and the 3 Momumental Books of Piano Etudes, massively polyrhythmic, and full of Virtuosic outbursts. A nice entry point for those totally unfamiliar with Ligeti's works.
Sequenza 21 is a forum for Modern Composers. and they, of course, have tracked this event closely. Read the comments on this page to see what they're thinking. Here