Now considered one of Bach’s most opulent musical achievements, his Christmas Oratorio went unheard for over a century after its first performances, until a resurgence of holiday celebrations brought it back into fashion. Each of its six cantatas was intended for a Christmas high feast day; Music Director Ken-David Masur and the MSO are joined by the Milwaukee Symphony Chorus to ensure the oratorio’s messages of contemplation, abundance, and jubilation ring from the rafters.