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In a long meter hymn, a singer - they call it 'lays out a line.' And then the whole church joins in in repeating that line. And they form a wall of harmony so tight, you can't wedge a pin between it.

"'Fresh Air' Remembers Poet And Memoirist Maya Angelou". "Fresh Air" with Terry Gross, www.npr.org. May 28, 2014.
In a long meter hymn, a singer - they call it 'lays out a line.' And then the whole church joins in in repeating that line. And they form a wall of harmony so tight, you can't wedge a pin between it.