String Quartet No.21 in D major, K.575was composed by famous composer Wolfgang Amadeus Mozart. This string quartets are well known as the 'King of Prussia Quartets'.
String Quartet No.22 in B-flat major, K.589
String Quartet No.23 in F major, K.590
String Quartet No.21 = King of Prussia Quartet No.1The reason that this music is called 'King of Prussia Quartets' is that this music was dedicated to 'Friedrich Wilhelm II, King of Prussia'.
String Quartet No.22 = King of Prussia Quartet No.2
String Quartet No.23 = King of Prussia Quartet No.3