Amazon.comThere are so many chant discs to choose from--how do you decide? Just choose this one and you'll have one of the best-sung and most beautifully recorded programs of traditional Gregorian chant, organized according to liturgical use and times of day--the Mass as well as appropriate psalms, antiphons, and responsories for morning, afternoon, and evening offices. And you can't get much more authoritative than the Gregorian Choir of Lisbon, a group of male singers who teach or study at the city's Gregorian Institute. The chants are associated with St. Anthony, a 13th-century Franciscan monk and the greatest Portuguese saint, whose travels and teaching took him from Lisbon-- which, according to ancient descriptions, was located "at the ends of the earth"--to Rimini and Padua, where he died in 1231. He was canonized less than a year later and lives musically through the Mass accorded to him, celebrated on his feast day, June 13. --David Vernier