DREI KLAVIERSTUCKE I, II & III (Three Piano Pieces), Opus 11, is a set of pieces for solo piano composed by Arnold Schoenberg.

The sections of the Schoenberg pieces included in the Terpstra synthesizer performance are the very beginning and very end of the first piano piece, the first half of the second piano piece, and the conclusion of the third piano piece. Schoenberg, who always saw his music in tonal terms, wrote in his Harmonielehre: "As more and more of the possible combinations of our twelve tempered scale degrees are felt and used as harmony, the stock of unused possibilities is being gradually exhausted; and the continuing need for new harmonic (and melodic) vocabulary will finally break through the boundaries of the system.

Then new systems of temperament with smaller intervals might come about, later perhaps even complete independence and freedom in the use of all conceivable intervals, all conceivable frequencies and combinations. Now the division of the octave into 53 equal parts would be an example of a new temperament that could come under practical consideration: specifically, whenever music has advanced so far that there is need for a system with about four times as many tones as we now have; and when there is need (or more correctly, when there is again need) for the purest possible intonation of the basic intervals – those determined by the first overtones – but at the same time, no wish to do without the convenience of a temperament."

The Terpstra synthesizer makes this speculation a reality in this performance. It has 55 touch sensitive notes per octave for five octaves with ample macros for rapid timbral or tuning changes. In this tuning, the sharps are quite distinguishable from their respective flats. The instrument was designed by Siemen Terpstra in Amsterdam resulting in a beehive-like cardboard model. AFMM Director J. Reinhard brought AFMM Board Member Joel Mandelbaum and the Maldeb Foundation into the project, which was successfully completed by builder Dylan Horvath in Toronto.