William Walker (May 6, 1809 – September 24, 1875) was an American Baptist song leader, shape note "singing master", and compiler of four shape note tunebooks, most notable of which was The Southern Harmony.
Walker was born in Martin's Mills (near Cross Keys), South Carolina, and grew up near Spartanburg. To distinguish him from other William Walkers in Spartanburg, he was nicknamed Singing Billy. He married Amy Golightly, whose sister Thurza married Benjamin Franklin White, publisher of The Sacred Harp, and died in Spartanburg in 1875. Walker is buried in Magnolia Cemetery, Spartanburg, Spartanburg County, South Carolina.
In 1835, Walker published a tunebook entitled The Southern Harmony, using the four-shape shape note system of notation. This collection was revised in 1840, 1847 and 1854. In 1846 he issued The Southern and Western Pocket Harmonist. Intended as an appendix to the Southern Harmony, the Pocket Harmonist contains a large number of camp-meeting songs with refrains. In 1867 (preface signed October 1866), Walker published a tunebook entitled Christian Harmony, in which he adopted a seven shape notation. He incorporated over half of the contents of The Southern Harmony in the Christian Harmony, and he added alto parts to those pieces which had lacked them before. For the additional three shapes, Walker devised his own system - an inverted key-stone for "do", a quarter-moon for "re", and an isosceles triangle for "si" (or "ti"). Walker issued an expanded edition of Christian Harmony in 1873. In the same year, he brought out a collection of Sunday school songs entitled Fruits and Flowers.
Walker is listed as the composer of many of the tunes in The Southern Harmony. However, he acknowledged that in many cases, he borrowed his tunes, probably from the living tradition of folk music that surrounded him. Glenn C. Wilcox (references below) describes the process as follows, quoting from Walker's own introduction: