When these clefs are placed on a line, they fix a reference note to that line: an F-clef says that line must be the F below middle C ... Picture: Alamy Another common clef is the bass clef. The bass ...

Treble Clef on upper staff; Bass Clef on lower staff (image ... Another example of 12th century notation. Note the variation of the letter F to the left of each read line. (image: The Schøyen ...