Stockhausen’s ‘Gruppen’ at Park Avenue Armory

From NYTimes.com:

Now, on Friday and next Saturday, the Philharmonic returns to the armory in similarly spectacular style for “Philharmonic 360,” a program of pieces that feature spatially dispersed players and multiple ensembles. Built around “Gruppen,” a work for three orchestras completed in 1957 by the visionary German composer Karlheinz Stockhausen, the program is characteristic of the extravagant projects with which the Philharmonic’s music director, Alan Gilbert, has concluded recent seasons.