Cadenza (meaning cadence) refers to a portion of a concerto in which the orchestra stops playing, leaving the soloist to play alone in free time, without a strict, regular pulse. A cadenza can be written or improvised. It’s usually the most elaborate and virtuosic part that the solo instrument plays during the whole piece. At the end of the cadenza, the orchestra re-enters, and generally finishes off the movement.
During the 19th century, composers began to write cadenzas out in full. Others wrote cadenzas for works, where the composer had intended for the solo to be improvised, in order for the soloist to have a well formed solo that they could practice in advance. Some of these have become so widely played and sung that they are effectively a part of the standard repertoire.
Contrary to other types of phono catridges, the moving coil principle is not suited for mass production. Each of the four coils contains between 11 and 24 turns of wire, depending on model, and has to be wound by hand under a microscope. The high degree of craftsmanship involved is one of the "secrets" behind Ortofon's reputation.