The Madrid "Auditorio Nacional de Música", finished at the end of the 80's has two concert halls, both conceived with organs.

The grand organ in the Symphony Hall, designed by Simon Platt and built by Gerhard Grenzing, was inaugurated in 1991 and completes the stage setting of this impressive 2.400 seat hall, offering a sort of musical reredos behind the orchestra. Its size (almost 6000 pipes of which 92 are placed in the façade) offered ample opportunity to develope a composition which tries to express visually the dynamic nature of music.

This organ/ reredos serves both to preside over the organ's own music and all other activities taking place in the Symphony Hall.