Based on online discussions about the Pig Piano Friends app, here are three topics and corresponding questions: Topic 1: Musical Experience What do you think about the app's piano playing experience and its ability to recognize user input? Topic 2: Friend Feature How do you like the social aspect of the app, particularly the ability to connect with friends and share music? Topic 3: Learning and Customization Do you find the app's learning features, such as lessons and exercises, helpful in improving your piano playing skills?