Butterfly Waltz  Sample   Lesson Sample  (late beginner solo) Download Version. Brian Cain's simple but delightful piece is fast and easy to learn in this "By Ear" lesson. The lesson starts with  a full demonstration of the arrangement and then teaches the song in two to four measure sections without using any print or video. You are talked through the lesson with the teacher describing every note and finger used. Any useful performance techniques are also described. Because you are learning the song "By Ear" you memorize it as you go through the lesson.