This is 'Aquarium' from Carnival Of The Animals (Le carnaval des animaux) by Camille Saint-Saëns - but nobody knows it is called that! Wonderful magical fantasy fairy tale magic tune suitable for Christmas and other magical and special moments
A cheerful, carefree and happy-sounding instrumental for that moment when you can stop being serious about everything that is serious.
Think cartoon and comedy, or circus, carnival and parade music.