Apart from prepossessions of scale, the song appears a play of thirds and fourths expanding and contracting in all dimensions from a tone to a tritonus. In the opening movement of A the singer outlines the minor sixth, c'd'-f, in which the song centres; the second movement shifting this up a semitone and touching successively the fifth, c'd', the fourth, b, and the minor third, a, within it. In beginning B1 he rises a major third above this shifted sixth, descending to the base by lapped and withdrawn thirds and an augmented fourth; and by repeating these movements in less pronounced fashion regains the level of the opening movement within a j\ tone at f+, emphasizing his permanent return to it by descending to the octave, cd, of its summit. In the climax which follows he completes the upper major third, f'-c'd', to a fifth, with a crowning minor third, g'a'-f, and descends lapping the first and withdrawing the second interval, sliding to f and returning through the initial sixth, c'd'-f, in its turn withdrawn to the fifth, c'd'-fg, and completed in a moment to the octave, cd. The opening movement of C1 moves within the initial sixth, analyzing the upper third irregularly, and the closing movement forms an interlude between the strophes,
