The early days of bluegrass saw performers adhering to a strict - if unspoken - law of 'men only.' A few brave women challenged that rule, lighting the way for generations of female musicians to follow. It has only been in the past few decades that women have been received on their own terms, and bluegrass has grown enormously as a result. Rounder Records has proudly supported female bluegrass artists throughout its thirty year existence, and artists like Claire Lynch, Lynn Morris, Alison Krauss, and Hazel Dickens have emerged as some of the most popular, successful, and respected musicians in modern roots music. With one unreleased gem joining selections from Rounder's large library of classic music, O Sister! is a revelation: the first compilation to thoroughly explore women's vast contribution to this unique American art.