the capitals in the north gallery were carved by the same sculptural workshop. The east gallery was the first to be finished, and it was followed by the completion of the north gallery. After the intermission of construction on the cloister, work was resumed in 1158. The south gallery was completed soon after, and the newly reconstructed west gallery was the last side of the cloister to be finished. Before the west gallery was completed, plans were made to construct the second story of the cloister. It is believed that the lower story's sculptural style is of better quality than that of the upper story. Library Together with the library of Toledo Cathedral, the Silos Library was the main repository of liturgical manuscripts of the Mozarabic rite until many were auctioned in 1878. The library still contains the Missal of Silos, the oldest Western manuscript on paper. There is a historic pharmacy with a specialist library. Silos scriptorium Some manuscripts from the Silos scriptorium are preserved at the British Library in London and the Bibliothèque nationale de France in Paris. One of the major books produced in the abbey was a finely illuminated Beatus manuscript (a commentary upon the Apocalypse); the text was completed (by two related monks) in 1091, but the illuminations (illustrations) were mostly done later by the prior, who finished his work in 1109. These include an important map of the Mediterranean regions. This is now in the British Library, having left the monastery by the 18th century. Music in the abbey The monks originally sang Mozarabic chant. At some point around the eleventh century they switched to Gregorian chant. In 1880 the abbey became a member of the Solesmes Congregation, which has a strong tradition of singing Gregorian chant. The singing at Santo Domingo de Silos has been influenced by the scholarship and performance style of Solesmes Abbey. Recordings Gregorian chant The monks of Silos became internationally famous for singing Gregorian chant as a result of the remarkable success of their 1994 album Chant, one of a number of recordings by the choir which have been released commercially. Chant peaked at #3 on the Billboard 200 music chart, and was certified as triple platinum, becoming the best-selling album of Gregorian chant ever released. It was followed by Chant Noël: Chants for the Holiday Season (also released in 1994) and Chant II (1995). Technically, the Silos monks