Stevie and Billy - Closed
Stevie is completely taken in with the mermaid song. If she had her guitar on her, she would have accompanied them. As it is, she sings back to them. She's got a great voice and musical sensibilities to be able to improv with them.
Of course, that's not great for anyone trying to keep Stevie out of the water and away from said mermaids. Oops.