The Blue Danube Sample  Lesson Sample by J. Strauss. Early Intermediate Level. This piano arrangement is based on the key excerpts of the original piece by Strauss. The lesson includes a full demonstration of the song followed by a detailed "by ear" lesson teaching the song in two to four measure sections. Learning a song this way, without print or video, allows the student to memorize the song while learning it and develop their ability to pick out other songs "by ear."