Eight Songs for a Mad King is a monodrama by Sir Peter Maxwell Davies with a libretto by Randolf Stow based on words of George III, written for the South-African actor Roy Hart and the composer’s ensemble The Pierrot Players and premiered April 22, 1969. Lasting half an hour, it is scored for a baritone with an extraordinary command of extended technique covering more than five octaves, and six players:fl(=picc), cl, perc(1), pft(=hpd,dulcimer), vln, vlc.
The eight songs are all based the tunes played by an actual mechanical organ owned by George III which used to try to train bullfinches to sing. The action unfolds as a soliquy by the king, the players being placed on stage in large birdcages, and culminates in his snatching and smashing a violin.
[from Wikipedia]

Here with the score

and here with the scenic action