When placed on the second line, the G clef is called a treble clef, although the two names are now synonymous. Instruments that use the treble clef include the violin, flute, clarinet, trumpet and saxophone.
When placed on the fourth line, the F clef is called a bass clef, although the two names are now synonymous. Instruments that use the bass clef include the double bass, bass guitar and tuba.
When placed on the third line, the C clef is called an alto clef. Instruments that use the alto clef include the viola and alto trombone. When placed on the fourth line, the C clef is called a tenor clef. Instruments that use the alto clef include the cello and trombone.
