This clef is used for the violin, flutes, oboe, cor anglais, all clarinets, all saxophones, horn, trumpet, cornet, euphonium, baritone, vibraphone, xylophone, mandolin, and guitar. It is also sometimes used, along with tenor clef, for the highest notes played by bass-clef instruments such as the cello, double bass (which sounds an octave lower), bassoon, and trombone. The viola also sometimes uses treble clef for very high notes. Treble clef is used for the soprano, mezzo-soprano, alto, contralto and tenor voices. The tenor voice sounds an octave lower

Treble clef is the upper clef in the grand staff for harp and keyboard instruments.