His “Kammersymphonie No. 1” in E Major as arranged by his student Anton Webern (a master composer in his own right) is just such a piece, steeped in the dense harmonic language of late Romanticism. It was originally written for 10 wind and five string instruments, but this arrangement is for flute, clarinet, violin, cello and piano, which means that each player is quite busy, and a full sound is achieved with just a few performers.