On Dec. 13 and 14, the musicians and choristers of the Orchestre symphonique de Québec and mezzo- soprano Marie-André Mathieu, directed by Quebec conductor Roseline Blain, presented Noël en Choeur, an invitation to celebrate the festive season with the grand classics of Christmas, such as Gustave Holst’s “On Christmas Day,” Karl Jenkins’ “Gloria in excelsis Deo,” Leroy Anderson’s cheery “Christmas Festival,” and traditional English carols such as “Hark! The Herald Angels Sing,” “Joy to the World,” “Have Yourself a Merry Little Christmas,” and of course, the “Hallelujah” chorus from Handel’s Messiah. Mathieu sang a scintillating rendition of Adolphe Adam’s “Minuit, Chrétiens!” to which members of the audience were invited to sing along (words projected above the orchestra). The program ended with another singalong as everyone sang “On vous souhaite un joyeux Noël et une bonne année” (“We wish you a Merry Christmas and a Happy New Year!”)