What type of music is known as a "total work of art," including both libretto and music all written by the composer

I believe it is the German word Gesamtkunstwerk which translates to "total work of art"

Explanation:

the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!