I know or could find little mention of composer Henri Muller. He’s apparently a composer, author, narrator, instrumentalist, singer, conductor, arranger, lyricist and musician. He’s been active since the late 1960s and is of importance to the Euro-western genre as a composer for documentaries.
MULLER, Henri [German] – composer.
Buffalo Bill and the Conquest of the East - 2012
Joë Hamman: The Frenchman Who Invented the Western – 2014