The tenth book in Claudia Mills' beloved series For Gus, the longest half hour of the day is spent practicing the piano. Why can't he be outside, shooting hoops with Ryan Mason? Even more painful are the lessons: Mrs. Moore complains about Gus's squishy fingers. But most painful of all is the piano recital. Gus has to play a piece called "The Horse Race," and he's not sure he will remember it. As a child, Grandpa played the violin, so he knows exactly...