
Quick answer — Gustav Mahler worked on Legend of the Galactic Heroes Gaiden: A Hundred Billion Stars (Music), Legend of the Galactic Heroes Gaiden: Spiral Labyrinth (Music), Legend of the Galactic Heroes: My Conquest Is the Sea of Stars (Music) and 1 more anime.
Gustav Mahler worked on Legend of the Galactic Heroes Gaiden: A Hundred Billion Stars (Music), Legend of the Galactic Heroes Gaiden: Spiral Labyrinth (Music), Legend of the Galactic Heroes: My Conquest Is the Sea of Stars (Music), The Melancholy of Haruhi Suzumiya (Music).