His name is Yoshihiro Kanno. He composed several soundtracks for anime/films and a myriad of original works for orchestra. Posting in this part of the request forum because he's mostly known for Angel's Egg and his other music sounds not stylistically similar to it.
If you were to buy something from Japan, I would be grateful if you were to grab an album of two of his off yahoo auctions or amazon. Jp name is 菅野由弘. The only his album that is available digitally is this one (https://www.amazon.co.jp/Yoshihiro-Kanno-Light-Water-Rainbow/dp/B00WRV2KXU/).