Few people have done more to thoroughly understand Southern identity than Bill Ferris. For the last half century, the folklorist has used photographs, field recordings and film to document the true character of the South. On Sunday, his "Voices of Mississippi" collection of interviews, films and songs won the Grammy Awards for Best Historical Album and Best Album Notes. Ferris joined "On Second Thought" last summer when Atlanta-based Dust-to-Digital released "Voices of Mississippi."