what is the musical fruit

The term "musical fruit" refers to beans in a popular children's rhyme and playground saying: "Beans, beans, the musical fruit,
The more you eat, the more you toot.
The more you toot, the better you feel,
So eat your beans with every meal!" The rhyme humorously refers to the fact that beans cause flatulence (tooting or passing gas) because they contain oligosaccharides. These are sugars that humans cannot fully digest, and when bacteria in the large intestine break them down, they produce gases like carbon dioxide, hydrogen, and methane, which causes flatulence. Hence, the "musical" aspect is a playful reference to the sounds produced due to this effect. So, "musical fruit" is a humorous nickname for beans based on their tendency to cause gas and the accompanying sounds.