What Is A Great Staff? A great staff is also known as a grand staff . It has eleven lines and ten spaces . E.g. The great staff or the grand staff has eleven lines and ten spaces because it consists of two different staves with five lines and four spaces each . The treble staff and the bass staff are the two staves used to make a great staff and these two staves are joined together with a brace . E. G. There is a broken line in a great staff and the broken line in a great staff is called the "middle C' . In a great staff or in music, the treble staff is used for notating high pitched sound while the bass staff is used to notate low pitched sound.