Page "Staff (music)" Paragraph 16

When music on two staves is joined by a brace, or is intended to be played at once by a single performer ( usually a keyboard instrument or the harp ), a great stave ( BrE ) or grand staff ( AmE ) is created.

Typically, the upper staff uses a treble clef and the lower staff has a bass clef.

In this instance, middle C is centered between the two staves, and it can be written on the first ledger line below the upper staff or the first ledger line above the lower staff.

When playing the piano or harp, the upper staff is normally played with the right hand and the lower staff with the left hand.

In music intended for the organ, a grand staff comprises three staves, one for each hand on the manuals and one for the feet on the pedalboard.