He goes to Dino World and tells the dinos he needs quiet for practice. At first, they don't quite get it and to top things off, a rooster crows loudly. Finally, though, there's quiet. Harry is now nervous, though --- he really doesn't want to disappoint Nana.
The dinosaurs tell him to relax. Trike sings off-key to prove that Harry really isn't even that bad. Harry tries to keep practicing, but he keeps messing up. He declares that he hates his playing and practicing (boring) and quits. At this, the musical notes run away.
Harry rebounds and tries to play againg, but notices his violin has quieted down - without the notes, there'sno music. So they try to get the notes back.
He and the dinosaurs follow a trail of piano keys. They reach a place that a musical instrument called Old Saxon (with the personality and style of a classic jazz player) tells them is called Jumping Joint. He says that this is where music in Dino World goes to have fun. The dinosaurs soon start playing and having fun, but Harry doesn't join in. He tells Old Saxon it's because he's no good. Old Saxon says that Harry just needs to loosen up, have fun and not worry about making "mistake-os." Harry says that practice is hard work. Old Saxon replies that he's "been there, done that." It didn't work for him, but what did work was playing and not worrying about making "mistake-os." So Harry gathers up his musical notes and returns home.
Later that day, Harry gives his performance. It's flawless and Nana and Mom are very happy. Harry says that it was a lot of fun.