"The Sistine Chapel Choir present ... Advent and Christmas music from the Vatican Library collection. Gregorian chant, Palestrina, Victoria, Allegri et al are recorded in the most evocative sacred space. Alas, an almost risibly ill-tempered performance, cheesy and queasy with excessive hairpins, is redeemed only partial by a guest appearance from Cecilia Bartoli, singing part of Perotin's Beata viscera with extraordinary grace".