Noun
sacred harp (uncountable)
(music) A genre of Christian music based on shape-note singing.
Sacred Harp (uncountable)
Alternative spelling of sacred harp
Another shape note tunebook named The Sacred Harp (1844) by Georgia residents Benjamin Franklin White and Elisha J. King became widely influential and continues to be used. Source: Internet
Sacred Harp is one of the most popular tune books using shape notes. Source: Internet