The Hutchinson Family Singers

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The Hutchinson Family Singers were an American family singing group who became the most popular American entertainers of the 1840s. The group sang in four-part harmony a repertoire of political, social, comic, sentimental and dramatic works, and are considered by many to be the first uniquely American popular music performers.

https://en.wikipedia.org/wiki/Hutchinson_Family_Singers
http://imslp.org/wiki/Category:Hutchinson_Family_Singers