For the upcoming new anime The Legend of the Galactic Heroes Die Neue These, famed composer Shin Hashimoto, aka Sin, provides a solemn main theme performed by an orchestra.
You can listen to the eight-minute tune with a preview below. three chapters including four episodes each in 2019.
The previous anime in 1998-2000 featured many classical music, mainly from neo-Romanticism between the mid-19th and early 20th centuries, and a very few original scores were used.