When two or more different pitches are connected by a curved line, we call this a: *

a tie

Explanation: A tie is a curved line that connects two or more notes of the same pitch.

answermicrotones;

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!