1790. December. A quintet for two violins, two violas, and violoncello D major (593 K.). 1791. January 5. A pianoforte concerto, B flat major (595 K.). January 14. Three German songs (596 K.). January 23, 29; February 5, 12, 28; March 6. Dances (599-607, 609-611 K.). March 3. A piece for clockwork, in F minor (608 K.). March 8. A bass air with obbligato double-bass, for Hrn. Görl and Pischlberger, "Per questa bella mano" (612 K.). Variations for the piano on the song "Ein Weib ist das herrlichste Ding" (613 K.). April 12. A quintet for two violins, two violas, and violoncello, in E flat major (614 K.). April 20. Final chorus in the opera "Le Gelosie Villane," by Sarti, for amateurs, "Viviamo felici in dolce contento" (615 K., unknown). May 4. Andante for a waltz on a small barrel-organ, in F major (616 K.). May 23. Adagio and Rondo for harmonica, flute, oboe, viola and violoncello in C minor (617 K.). June 18. In Baden "Aveverum corpus" (618 K.). July. A short German cantata for solo voice and pianoforte, "Die ihr des unermesslichen Weltalls Schopfer" (619 K.). A glance at this catalogue is sufficient to prove that he wrote whatever he was requested, either by commission or to please his friends. For his own playing, no doubt at a concert, he wrote the pianoforte concerto in B flat major, which like most of the compositions of this period, is distinguished by its mild and earnest tone and charming euphony. The two fine quintets for stringed instruments were written "at the earnest solicitation of a musical friend" (Vol. III., p. 18) who was no doubt acquainted with Mozart's poor circumstances, and wished to afford him a worthy opportunity of turning his art to account. The spirit in which Mozart undertook commissions which were often of a very subordinate nature may be best seen in his composition for a mechanical timepiece which was ordered by Count Deym for Müller's art-collection, then attracting great attention. The serious temper which it displays, and {BADEN, 1791--STOLL.} (281) the thoroughly technical treatment of the composition, betray no evidence of a work merely done to order. Another occasional composition is the beautiful chorus with stringed quartet accompaniment, "Ave verum corpus." Mozart's wife was staying at Baden for the waters in the summer of 1790, and again in 1791, in company with her sister Sophie. There Mozart became acquainted with the schoolmaster and choirmaster Stoll, an ardent admirer, who took pleasure in making himself useful to Mozart and his wife. That Stoll could appreciate the fun of Mozart, in his unrestrained moods, is shown by the superscription of a note (July 12, 1791)-- Liebster Stoll! Bester Knoll! Grösster Schroll! Bist Stemvoll! Gelt das Moll! Thut dir wohl!