The "Picnic" song is also a Japanese nursery rhyme instead of British. It's famous for the electronic musical chime made by Nichol Electronics used in ice cream trucks, that begins the song with a "Hello" voice.
Vocal: https://www.youtube.com/watch?v=hHuAg5mFDLM
Chime: https://www.youtube.com/watch?v=A7WuxWpYUY4