<Tr> <Th> Occupation (s) </Th> <Td> Singer, songwriter </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1913--1940 </Td> </Tr> <Tr> <Th> Labels </Th> <Td> Edison, RCA Victor, Columbia, Old Homestead </Td> </Tr> <P> Marion Try Slaughter (April 6, 1883--September 14, 1948), better known by his stage name Vernon Dalhart, was a country music singer and songwriter . He recorded the first country song to sell one million copies . </P>

Who recorded country music's first big hit million seller record and what was the name of the song