musical notation - a notation used by musicians

G clef, treble clef - a clef that puts the G above middle C on the second line of a staff

bass clef, F clef - a clef that puts the F below middle C on the fourth line of a staff

alto clef, viola clef - a clef that puts middle C on the third line of a staff

C clef - a movable clef that puts middle C on one of the lines of a staff

soprano clef - a clef that puts middle C on the bottom line of the staff

tenor clef - a clef that puts middle C on the fourth line of the staff; used for writing music for bassoons or cellos or tenor horns