Duggee and the Squirrels are enjoying a peaceful day outside when they hear an intriguing sound. Duggee points to where the sound is coming from, and they suddenly realise who it is - the famous all-bird super group Hot Cheap! Soon the whole neighbourhood notices, and everyone gathers around, excitedly cheering.\n\nThe Squirrels are curious about the sound that the birds are making. Luckily, Duggee has his A Cappella Badge! Duggee teaches the Squirrels how to imitate different musical instruments and sounds using just their vocals - eventually putting them all together to come up with their very own a cappella masterpiece. Soon, a crowd of adoring fans are drawn to the Clubhouse to hear more, and the Singing Squirrels are joined by none other than Hot Cheap themselves for an impromptu sing off! Will they crush it to earn their A Cappella Badges?