In the musical piece titled "Gleeful," the pixelated versions of Mickey and Boyfriend (BF) are joyfully singing together. BF's singing is quite impressive, matching Mickey's delightful performance. Mickey, the cheerful mouse, radiates positivity and kindness. Meanwhile, BF, a short and cheerful kid, sings with great enthusiasm, embodying the song's theme of happiness, aptly reflected in its title: "Gleeful."