The melody is notable in being confined to the notes of the hexachord. Two of these are tetrachords, the third a hexachord. Applying the circle of fifths transformation to the chromatic hexachord produces the diatonic hexachord . The leading Adagio is based on a hexachord. The C hexachord, containing neither B, was called "hexachordum naturale". Change from one hexachord to another was possible, called a "mutation". The hexachord featured is sometimes called the 'Ode-to-Napoleon' hexachord (014589). "hexachord" of which the signed note is the "mi" or the "fa" respectively. Schoenberg used the hexachord in the song "Seraphita" (op. A hexachord that is self-complementing for a particular permutation is referred to as "prime combinatorial". Babbitt's Second Quartet and "Reflections" for piano and tape feature the hexachord .