Abstract: A novel and simple method for coding or indexing songs according to their highest and/or lowest sung notes, and the corresponding keys or tonalities, is proposed. Numbers 1 through 12 are used in lieu of the musically more erudite traditional musical appellations. Individual voices can be coded or indexed similarly. When the songs are transposed to the proper tonalities, so that all the sung notes are within the vocal range of the individual singer, the performance will enjoy optimal vigor and minimal strain.