Brenda Lee was fifteen when "I'm Sorry" hit No. 1 on the Billboard Hot 100 in the summer of 1960, a teenager's voice wrapped around a grown woman's heartbreak. It's one of the first records built on the smooth, string-heavy Nashville Sound, the one AllMusic calls her definitive recording, inducted into the Grammy Hall of Fame in 1999. This set gathers that song with the rest of her early-sixties hit run, when she was one of the biggest pop stars in the country despite her age.