https://www.post-gazette.com/local/north/2011/03/27/shape-note-singing-is-making-a-comeback/stories/201103270258
'Shape-note' singing is making a comeback | Pittsburgh Post-Gazette
In Sacred Harp singing, there is no audience.
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https://whyy.org/articles/shape-singing-strikes-high-note-in-philadelphia/
'Shape' singing strikes high note in Philadelphia - WHYY
The centuries-old tradition of sacred harp choral singing brings people of any singing ability into 4-part harmony.
high noteshapesingingstrikesphiladelphia