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: