When it's time for Grandpa (and his cat) to move in with Callie's family, some things change around Callie's house. What doesn't change is her love for sitting at the piano and singing along as Grandpa plays. When that changes too, as Grandpa can't always remember the words anymore even though his fingers still remember how to play the songs, Callie comes up with a great idea that keeps helping even after another big change happens.