Kontakte is a Stockhausen classic from 1959, for electronics, percussion and piano (played here by David Tudor). One of his "moment form" compositions, which "...lead up to no climax, nor do they have prepared, and thus expected, climaxes, nor the usual introductory, intensifying, transitional, and cadential stages which are related to the curve of development in a whole work; they are rather immediately intense and -- permanently present -- endeavor to maintain the level of continued 'peaks' up to the end; forms in which at any moment one may expect a maximum or a minimum, and in which one is unable to predict with certainty the direction of the development from any given point... leading to timelessness."