This paper will examine one area of Mozart's work, the Singspiele. This study is an analysis of the principal tenor roles of Mozart's Singspiele. The organization for analyzing these works conforms to three periods in Mozart's life. (1) Childhood and Early Youth, to 1774; (2) The Period of the First Masterworks, 1774-1781; and (3) The Years in Vienna, 1781-1791. Related biographical data and historical background have been utilized in discussing each work. Because the Singspiele is a musical composition, analyses will consider music as the major source of development, using plot and character wholly as supporting features.