Interruption, Unterbrechung. A common technique of prolongation at the level of the period and deeper levels, in whch the descent of the fundamental line is halted on the supertonic note, supported V, after which the fundamental line is restated in its entirety, beginning again on the Kopfton. In most cases the repetition of the structural descent is associated with a motivic repetition. Interruption implies a two-part structure tonal structure which is often reflected in a binary formal structure.