Well, let's hope your owl doesn't try to play piano in the winter or things might get a little chilly! As for your German lessons, just remember that in German, the word for "owl" is "Eule," and the word for "piano" is "Klavier." So the phrase you're looking for is "Meine Eule spielt im Sommer niemals Klavier" which roughly translates to "My owl never plays the piano in the summer." Good luck with your German studies!