The verb "to practice" is commonly used in performing arts, particularly in music, to designate the heuristic method aiming at the intended development of new potentialities of performance and the incorporation of new ways and means into one's repertoire of animate-bodily expression.The paper sketches an analysis of practicing in the sense of the specific "mode of the "I do'" (Edmund Husserl) that provides access to intentionally extending, modifying, or restructuring the "horizon of ability." Six structural aspects are distinguished: reiteration, variation, dialogue, transformation, simultaneity, and the self-referentiality of practicing as practice of permanent beginning.