Noun
English Wikipedia has an article on:shape noteWikipedia
shape note (uncountable)
A system of music notation designed to facilitate choral singing, and the style of psalmody associated with it. The heads of the notes are of various shapes, not always round.
shape-note (uncountable)
Alternative form of shape note
shape-note
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
Easily learned and incorporating singers into four-part harmony, shape note music was widely used by evangelical preachers to reach new congregants. Source: Internet