The episode starts out with the students getting their instruments for the school marching band, and Gumball asks Principal Brown what his instrument is, which is a triangle.

Darwin gets a swanee whistle and plays a beautiful merrily tune, surprising the students and Principal Brown, and as a reward, Darwin joins the solo in the marching band, but Gumball starts to get jealous. Darwin then tells Gumball to come back when he's not jealous.

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