Marshall has developed a unique musical style that combines classical, inspirational, film score, and new age genres of music all in one. He has recorded multiple albums, including his compilation of arrangements inspired by Carl Bloch’s paintings of the life of the Savior titled, This Is the Christ as used by the BYU Museum of Art walking tour for its Carl Bloch exhibit. Marshall’s film scores and symphonies have been performed and recorded across the globe, including by the China Philharmonic Orchestra.