Aerith's Theme (Intermediate)  Sample  Lesson Sample  From Final Fantasy. In this "by ear" lesson you will learn a late beginner arrangement of this famous video game theme song. This lesson starts with a full demonstration of the song followed by a detailed "by ear" lesson demonstrating and explaining every phrase and note of the song. This song is also available in a late beginner level arrangement. Learning "by ear" is the fastest way to learn a song and memorize it at the same time.