I first viewed Allegro non Troppo in film school...it was introduced as an "Italian Fantasia". After viewing it I realized such a comparison didn't give it due credit for its originality: that such sophisticated animation is accompanied by classical music is the beginning and end of the comparison -- and it was unique for its time, intercutting live action with animated sequences.
The subject matter is not the lollipops and roses of Fantasia: some of the animation shorts effectively focus on somber and dreary post-WWII Europe, while some lighter sections of both the animation and live-action are hilariously comic. Therefore I would suggest parental viewing prior to permitting very young children viewing the film in its entirety. Some of the most entertaining live-action features the director dealing with the film's musicians, an orchestra of "vintage" ladies...if you appreciated the cinematography of Roberto Benigni's "Life is Beautiful", you should enjoy Allegro again and again...I have purchased several copies for friends' birthdays, etc. It has been off the market for several years, and this is the first time I have been able to purchase it outside the USA. Happy viewing!