The musicians who created the O Brother, Where Art Thou? soundtrack will reconvene June 13 for a concert at Carnegie Hall in New York City. Alison Krauss and Union Station, John Hartford, Gillian Welch, Ralph Stanley, The Whites and The Cox Family are among the artists who will participate. ... Slobberbone's Everything You Thought Was Right Was Wrong Today was named top country album Tuesday night at the Dallas Observer Music Awards. DO writer Robert Wilonsky says the band is the city's best country outfit because songwriter Brent Best "toys with the conventions of the genre; he's a tear-in-you-beer kinda guy, only he prefers his booze a little stronger." ... Mark McGuinn ("Mrs. Steven Rudy") has signed for management with Scott Siman, whose clients include Tim McGraw, Billy Gilman and Jessica Andrews.