The initial 52-episode plan for Yamato III meant a lot of music would have to be written to emphasize the newness. This lead to an embarrassment of musical riches when the series was cut down to 25, and it took decades for it all to be released. See the complete record here.
Like Yamato 2 before it, Yamato III took many years to finally appear in full on home video, preceded only by a 90-minutes compilation movie edited as a TV special. But as the series moved from one video release to another, it was continually enriched by new package art. See it all here.
