What is tubs notation?

Tubs notation is a musical notation system created by British musician Jon Rose in the late 1970s. It is a form of graphical notation that uses symbols, shapes, and lines to represent musical ideas. The notation is designed to be used by musicians with any background or training and requires no prior knowledge of traditional music notation. The name "Tubs" comes from the cylindrical shape of the notation symbols, which resemble tubs or barrels. The notation has been used in various genres of music, including experimental, avant-garde, and free improvisation. Tubs notation is often used to represent non-pitched sounds, such as extended techniques on traditional instruments and found objects used as instruments. It is also used to represent rhythmic ideas, textures, and gestures that are difficult to notate using traditional music notation.