In America, few musical genres are as iconic as the blues. Today, we speak with septuagenarian guitar hero Buddy Guy — the man credited with (literally) distorting the blues. He'll tell us how he went from being a young boy in rural Louisiana to become one of the genre's most influential guitarists. Also: San Francisco chamber group Tin Hat draws heavily from Southern blues and bluegrass. They join us for a live performance in the Soundcheck studio. Plus: Our cd picks of the week.