Juan Manuel de Rosa
Composer from the 1999 Netherlands TV movie The Death of a Composer: Rosa, a Horse Drama, directed by Peter Greenaway. A Brazilian, he goes to America and ends up composing scores for Westerns. Played by Lyndon Terracini.
It was originally the opera Rosa with libretto by Greenaway, and a score by real composer Louis Andrieesen that premiered in Amsterdam in 1994. In the opera, he lives in an Uruguayan abattoir with his horse and fiancee until he is mysteriously murdered in 1957.