Color-coded notation is a music notation system that uses colored notes to represent different pitches. It was developed in the early 20th century by American composer Henry Cowell.

Number notation is a music notation system that uses numbers to represent different pitches. It was developed in the early 20th century by American composer John Cage.

Graphic notation is a music notation system that uses symbols to represent different musical elements, such as pitch, rhythm, and dynamics. It was developed in the early 20th century by American composer Earle Brown.

Extended notation is a music notation system that uses traditional notation, but adds additional symbols to represent new musical techniques. It was developed in the early 20th century by American composer Elliott Carter.

Grid notation is a music notation system that uses a grid to represent different musical elements, such as pitch, rhythm, and dynamics. It was developed in the early 20th century by American composer Morton Feldman.

Computer-generated notation is a music notation system that uses a computer program to generate music. It was developed in the early 20th century by American composer John Chowning.

Mixed notation is a music notation system that uses a combination of traditional notation and graphic notation. It was developed in the early 20th century by American composer George Crumb.

Extended notation is a music notation system that uses a combination of traditional notation and extended notation. It was developed in the early 20th century by American composer Elliott Carter.

Computer-generated notation is a music notation system that uses a combination of traditional notation and computer-generated notation. It was developed in the early 20th century by American composer John Chowning.

Mixed notation is a music notation system that uses a combination of traditional notation and mixed notation. It was developed in the early 20th century by American composer George Crumb.

Extended notation is a music notation system that uses a combination of traditional notation and extended notation and computer-generated notation. It was developed in the early 20th century by American composer Elliott Carter.

Mixed notation is a music notation system that uses a combination of traditional notation and mixed notation and computer-generated notation. It was developed in the early 20th century by American composer George Crumb.

Extended notation is a music notation system that uses a combination of traditional notation and extended notation and mixed notation and computer-generated notation. It was developed in the early 20th century by American composer Elliott Carter.

Mixed notation is a music notation system that uses a combination of traditional notation and extended notation and mixed notation and computer-generated notation and graphic notation. It was developed in the early 20th century by American composer George Crumb.

Extended notation is a music notation system that uses a combination of traditional notation and extended notation and mixed notation and computer-generated notation and graphic notation and color-coded notation. It was developed in the early 20th century by American composer Elliott Carter.