 The further down on the stave a clef is positioned, the higher the tessitura; conversely, the higher the clef is positioned, the lower the tessitura.Since there are five lines on the stave, and three clefs, it might seem that there would be fifteen possible clefs.Six of these, however, are redundant clefs (for example, a G-clef on the third line would be the same as a C-clef on the bottom line).