Alto Clef The C clef giving the position of the note middle C on the middle line of the staff.
Bass or F Clef See 'Signs on the staves.'
C Clef The alto clef or tenor clef which give the position of the note middle C. In an alto clef it is the center line. In a tenor clef it is the second line from the top.
Clef Literally means 'key', it's a symbol at the beginning of a staff that denotes the pitch of the notes.
