Young Lentil wants to learn to sing, but no matter how hard he tries he can’t sing on key. He can’t even pucker his lips to whistle! So Lentil learns to play the harmonica instead and beautifully carries his tune through the winding streets of Alto, Ohio. Lentil masters his craft just as the beloved Colonel Carter returns to town and the Alto residents decide to plan a special celebration. But Old Sneep, the grouchiest man in town, doesn’t want anyone celebrating Colonel Carter’s homecoming. When Old Sneep stops the welcoming parade in its tracks, Lentil’s music turns out to be just what Alto needs.