Gustafa explains that he just finished making a new composition and now he has to consider what kind of tune would go with it. He suddenly gets an idea to make a tune in your image! Would you teach him some small, simple things you do on your farm? It would help him get a good idea for his tune. Tell him it will be fine (いいですよ) and you'll immediately start showing him different things you do on your farm until Gustafa becomes inspired.
When you finish with your demonstration, Gustafa feels that listening to your story makes him want to live on a farm too. He would probably enjoy it. Gustafa figures he can now quickly make a tune and thanks you for your help.