Three sisters and mom sing together, blending their genetically similar vocal chords -- which make their harmonies shimmer with richness. The Murray Girls partner their voices in Blood Harmony, singing cheerfully macabre murder ballads, traditional tunes, Celtic songs, and blues: wistful stories set to heartbreakingly beautiful melodies. The four contraltos sing your new favorites: family arrangements of familiar and obscure music covering hundreds of years of musical history.