LOL! That's in 1967 dollars. There's well over 5,000 pickers in Nashville after adjusting for inflation.
Of course not all friends of Nashville mothers will necessarily play "clean as country water," "wild as mountain dew," or be able to "pick more notes than the number of ants on a Tennessee anthill," and some Nashville mothers may have guitar pickin' friends in common, but we haven't even begun to apportion pickers to women without children.