Anonymous 4 are known for their scrupulous recordings of 13th and 14th century English chant and polyphony. 'Lammas' refers to the Celtic festival of harvest, celebrating the Assumption of the Virgin Mary. Much of the music of the time-at least that still existing today-was written to accompany the Catholic Mass. Therefore each part of the service, which was and is very specifically structured, assumed a certain form, depending on the context: motet, Antiphon, Conductus, introit, hymn, etc. The four women of Anonymous 4 take these relics and give them new life, gently and sweetly entreating them into the present day.