Little prince quest 5

Hello! I have been playing for a couple of months and I'm doing the little prince quests these days. But I can't complete the 5th quest in hermit valley.

When the little prince asks "Mind trying this for me?" And hands us the ukulele, I pressed the F key but the sheet music/music keys don't appear. Then he asks us to play again and I did. But then the screen just zooms in on the sunset and freezes. I've tried multiple times and this keeps happening. Am I doing something wrong? Do we need specific sheet music for this? Or is this just a glitch?