A highlight of the (BEMF) festival was a superb multimedia presentation by the Newberry Consort in Jordan Hall on Thursday afternoon drawn from the 13th-century Cantigas de Santa Maria,a manuscript attributed to Spanish ruler and arts patron Alfonso X. This stellar Chicago ensemble, directed by David Douglass (vielle and rebec) and Ellen Hargis (soprano), performed a dozen richly multicultural cantigas, while projecting the brightly colored illustrations that originally accompanied them onto an overhead screen, along with translations of the lyrics. The effect was near total immersion in these stories devoted to Mary, with intricate polyphony improvised by the skilful ensemble, which was assisted by guest artists from the Exsultemus vocal ensemble.