For 10 points, identify this composer of the 2nd Viennese school who revolutionized music with the twelve tone scale.
The second of this man's four string quartets sets the poetry of Stefan George to music.  A harpsichord concerto of Georg Matthias Monn inspired this man's cello concerto. The medieval Danish legend of Waldermar and Tove as written by Jens Peter Jacobsen inspired this man's cantata for voices and orchestra that depicts Castle Gurre. The Jewish chorus intones Sh'ma Ysrael to conclude his piece depicting a ghetto, A Survivor from Warsaw. This man, who never finished his opera Moses and Aron, used a style of "speech-singing" which depicts the moonstruck Pierrot. For 10 points, identify this composer of the 2nd Viennese school who revolutionized music with the twelve tone scale.
The second of this man's four string quartets sets the poetry of Stefan George to music.  
Arnold Schoenberg