Staff - The most frequently used staff has five horizontal lines, with four spaces, upon which the notes and other musical symbols are placed.
Clef - A symbol placed at the beginning of the staff to indicate the pitch of the notes on the staff. The most commonly used clefs in choral music are the G, or treble, clef 
and the F or bass clef 
. On the keyboard, all the notes above middle C are said to be in the G clef; all the notes below middle C in the F clef.
Ledger lines - Short lines placed above and below the staff for pitches beyond the range of the staff.
Grand staff, Great staff - The G and F clef staves together make the grand (great) staff.
