I want to sing

Isabel has started to like singing by herself. If I try to sing with her, she yell "I want to sing". Sometimes she'll say "Mommy, sing Bubble", so I'll begin to sing "bubbles", thinking she's going to join me. No, she starts to sing "Spaghetti". She just did that so that I wouldn't be singing the same song she wants to sing. Smartie Pants.