Mozart’s String Quartet #19, K. 465, Piano Concerto # 21, K. 467, and his Symphony #41, K. 551, are all in the pleasant key of C major. K. 465 was written in 1785 and is the last quartet in a set of six quartets dedicated to Haydn. K. 467 was also written in 1785 and is Mozart’s last piano concerto. K. 551, the Jupiter Symphony, was finished in 1788, and is the last symphony Mozart wrote. Although these three works are in the same key and were written in close proximity to each other, they have very different and distinctive motifs and themes.