Various artists - Can’t You Hear Me Callin’This four-CD box set of bluegrass is the perfect gift for anyone who was smitten by rootsy sounds of O Brother Where Are Thou? Spanning eight decades, from Charlie Poole and the North Carolina Ramblers’ 1925 track “Don’t Let Your Deal Go Down Blues” to the Dixie Chicks’ 2002 number “Tortured, Tangled Hearts,” it’s an exhaustive summary of high lonesome sounds. Standout cuts include Bill Monroe’s original “Blue Moon of Kentucky” and The Byrds’ previously unreleased gem “Black Mountain Rag.”