Mozart's greatest works were written in Vienna in the decade before his death (1781-1791). This biography focuses on Mozart's dual roles as a performer and composer and reveals how his compositional processes are affected by performance-related concerns. It traces consistencies and changes in Mozart's professional persona and his modus operandi and sheds light on other prominent musicians, audience expectations, publishing, and concert and dramatic practices and traditions. Giving particular prominence to primary sources, Simon P. Keefe offers new biographical and critical perspectives on the man and his music, highlighting his extraordinary ability to engage with the competing demands of singers and instrumentalists, publishing and public performance, and concerts and dramatic productions in the course of a hectic, diverse and financially uncertain freelance career. This comprehensive and accessible volume is essential for Mozart lovers and scholars alike, exploring his Viennese masterpieces and the people and environments that shaped them.