Clave is a percussion instrument. You play Claves by hitting them together in rhythm. Usually percussion music is written all on one line or space, because these instruments can't change pitch. What is the name of the line or space these notes are all written on?

Percussion Staff

Explanation:

A staff is defined as a set of five horizontal lines and four spaces each representing different musical pitches. Since clave is a percussion instrument, the music is written on a percussion staff. In a percussion staff, music is written all on one line or space, because these instruments can't change pitch, hence the answer above.