Terry Gross

Rap vocalist Darryl McDaniels of RUN-DMC talks about the group's success. McDaniels is the "DMC" of the group. They were the first rap group to earn gold, platinum and multi-platinum albums. Their most recent album is "Down with The King" released in 1994. But RUN-DMC is expected to release their next album later this year. The group is credited with bringing new fashions, new dances, and new language to popular culture.

In honor of Fresh Air's 10th anniversary as a national show, musician Dave Frishberg performs an original song, commissioned by the show's staff.

Historian James McPherson is a Professor of American History at Princeton University. He's written eleven books about the Civil War, including his Pulitzer Prize winning book, "Battle Cry of Freedom." His latest book is "For Cause & Comrades: Why Men Fought in the Civil War" (Oxford University Press). Drawing on 25,000 letters and 250 private diaries, McPherson looks at why so many soldiers willingly risked their lives to fight in the war.