Leonard Rosenman (1924-2008) was a composer for television and film. He is perhaps best known for his Academy Award winning work in Barry Lyndon and Bound for Glory, and I especially enjoyed his contributions to the film Star Trek IV: The Voyage Home. Rosenman studied composition at the University of California Los Angeles with Arnold Schoenberg, amongst others, and throughout his life also composed several concert works, including pieces for piano and strings. His only brass alone piece that I could find is the simply titled:
I could not find any information about this work, less its recording on an album by the Los Angeles Brass Society and the LA Phil. The album seemed to suggest that Lester Remsen, the conductor of the ensemble, commissioned a number of fanfares in 1969 by top Hollywood composers.
Here is an excerpt: Rosenman – Fanfare 1969 Excerpt