who were the unmasked singers on the masked singer?
['1 of 5. Load Video. Dionne Warwick (The Mouse) ... ', '2 of 5. Load Video. Lil Wayne (The Robot) ... ', '3 of 5. Load Video. Drew Carey (The Llama) ... ', '4 of 5. Load Video. Chaka Khan (Miss Monster) ... ', '5 of 5. Load Video. Tony Hawk (The Elephant)']