The armonica made quite a hit, particularly in Germany. Mozart was introduced to it by Franz Mesmer, who used his to 'mesmerize' his patients, and later Mozart wrote two works for it (a solo armonica piece, and a larger quintet for armonica, flute, oboe, viola and cello). Beethoven also wrote a little piece for amonica and narrator, and many of their colleagues of the day composed for it as well—some 200 pieces for armonica (solo, or with other instruments) survive from that era.