Unison/2-part choir - Digital Download SKU: LX.15-1654H I-Song On One Note II-The Knock Knock Song. Composed by Bill Vollinger. Novelty. Octavo. 16 pages. Heritage Music Press #e15/1654H. Published by Heritage Music Press (LX.15-1654H). UPC: 000308056976.Creativity and quick-wittedness abound in this pair of dynamite pieces, all wrapped up into one octavo. A Song on One Note (also a terrific encore!),unveils its true identity by the clever use of text and an attractive accompaniment that makes you almost unaware that the entire melody is being sung on just ONE SINGLE NOTE. The Knock Knock Song makes witty musical use of the popular joke form and is an excellent opening number for any concert.