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 published a collection of Sunday school songs entitled Fruits and Flowers. As composer Walker is listed as the composer of many of the tunes in The Southern Harmony. But, 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: In working from original tune to finished hymn, Walker borrowed lyrics from established poets such as Charles Wesley (a common practice in his tradition), who had set many of his works to music earlier. Walker added treble (upper) part and bass parts, to create three-part harmony. Legacy Two of Walker's tunebooks remain in print. Facsimiles of his Southern Harmony (1854 edition) continue in use at an annual singing in Benton, Kentucky. Until 2010, Walker's Christian Harmony existed in two editions: a facsimile reprint of the 1873 edition, and a revision by O.A. Parris and John Deason first published in 1958, employing the more familiar note-shapes of Jesse B. Aikin. In 2010, a combined version of the Christian Harmony, known as the Georgia Christian Harmony or the Christian Harmony 2010, was published, using Aikin's shape-note system. The Christian Harmony 2010 incorporated the entire contents of both the 1873 edition and the 1958 Deason-Parris edition, plus a number of new songs. Walker's compositions and arrangements are widely sung today by Sacred Harp singers as well as others. His work is represented by 13 songs in the current 1991 "Denson" edition of The Sacred Harp, and by 12 in the "Cooper" edition. According to the collated minutes kept by the Sacred Harp Musical Heritage Association, his song "Hallelujah" is sung more frequently at Sacred Harp conventions than is any other. The Walker songs are generally sung in four-part versions, with alto parts that were added by early 20th-century composers. Representation in other media Charles Faulkner Bryan composed the music of folk opera Singin' Billy (1952), base on a libretto by Donald Davidson and featuring Walker as the main figure. The opera incorporates five hymns from Southern Harmony. Donald Grantham incorporated several tunes from Walker's Southern Harmony in his 1998 Southern Harmony, a work for wind band. The first Christian Harmony All-Day