Another nostalgic, obscure 80s anime/music film is Robot Carnival. It was touted as a Japanese Fantasia. It is very of the period, but features some of the greatest animators of the era. There are two really excellent shorts on there:
Cloud is my favorite and
Presence is also insanely good. They are all pretty entertaining. A 4K remaster was recently released and is actually pretty awesome, including a documentary with a lot of archive pics, footage and details. It is on a free service with commercials on Amazon.
Cloud is a sort of art house take on Pinocchio: