Waltz Op 39 no 15 (Brahms) Sample  Lesson Sample by Brahms. Early Intermediate Level. This is the original composition (not an arrangement) of Brahms Waltz in A flat (Op 39 no 16) from the collection called Sixteen Waltzes for Piano. The piece is demonstrated fully and then taught completely "by ear," slowly describing every note and finger used to play the song and any useful performance techniques.