麦兜电影版的第五部作品，春田花花幼稚园出现了史无前例的经济困难。即使校长（黄秋生 配音）和陈老师（许飞 配音）以及麦太（吴君如 配音）等家长使出浑身解数也没法解决。于是学校召开了一次校友筹款晚会，但是长大成人的校友们都没什么出息，欣慰的是校长无意之中发现了麦兜等小朋友的音乐天赋。经过挫折，校长终于找到了胶牌经理人（郑中基 配音）为小朋友合唱团打理事宜，演出大获成功通告不断。可惜最后关头经理人失踪，合唱团并没有为学校带来大收益。可校长在最后一场演出中发现了惊喜，春田花花幼稚园也还有成功的校友存在，众校友再一次感到了人生的真谛。The principal of the kindergarten put a lot of effort into teaching music to the kids because it was "free". The was of importance because the kindergarten was under the threat to be shut down. Thus, the principal decided to run a fund-raising dinner and invited the alumni of the kindergarten to donate. The dinner, however, turned out to be a failure because the alumni weren't able to donate much money, because the alumni were mainly gangsters. Later, the principal found an agent to publicize the choir of the kindergarteners and help them earn performing opportunities. After attending several performances, with astounding performances, including one in the concert of Andy Lau, the agent scammed all the money the choir earned and ran away. The kindergarten shut down eventually, but the musical education the alumni received had profound influence on them.