Although they were written almost two centuries ago and in many cases their copyrights have entered the public domain, the productions of zarzuelas that are performed in the few Spanish theaters that give the genre do not interpret the original score and libretto, but rather a editing them. It is a work of updating, revision, transformation and arrangement carried out by musicologists, a work halfway between philology, musical history and interpretation. The last production of the Teatro de la Zarzuela has been The king who raged, scored by Ruperto Chapí when we have the information. The works of this master have been in the public domain for 32 years but derivative works, such as critical editions, if they have sufficient originality, continue to generate copyright, and they will do so for 70 years, as if they were a new work. That is, when it is represented The king who raged, Although neither Chapí (who died in 1909) nor his heirs are paid any more for their work, the critical editor Tomás Marco does, who published his version of this zarzuela in 1996 and is on which the recent staging is based.