This duet is fanmade. The big one is lemon yellow with purple heart eyes, a blue nose and a fuschia mouth. The little one is magenta with hamster style ears, hands and feet, blue heart eyes, a yellow nose and a green mouth. This duet sings "Arabella Miller". The big one has the same voice as the fanmade Peach Sing-a-ma-jig and the little one has the same voice as the fanmade Watermelon. This is the first duet with a hamster.
Here's how they sign on, enter song mode and sign off.
Sign on: Both (at the same time): "Hello!"
Song mode entry: Both: "Song!" (Big one first)
Sign off: Both: "Bye Bye!" (Big One First)