Compared with this art, Schoenberg's Pierrot lunaire is lukewarm lemonade.

On Alban Berg's Altenberg Lieder, Letter from Busoni to his wife, dated (Paris, le), 23. Jn. 1913, in Busoni: Briefe an seine Frau, ed. F. Schnapp (Erlenbach-Zürich/Leipzig: Rotapfel-Verlag, 1935), 279.