Bach Conducts Christmas Joy: A Cantata's First Performance

Bach's choir erupted in written laughter, actual "ha ha ha" syllables cascading through the fugue. His Christmas cantata demanded singers giggle in harmony, a radical move when church music meant solemnity. The text promised mouths "full of laughter," so Bach scored it literally: overlapping voices tumbling over each other in joy, eight measures of infectious musical hilarity. Leipzig's congregation had never heard anything like it. The technique spread slowly, too playful for most Protestant churches, but BWV 110 proved something crucial. Sacred didn't have to mean serious. Bach had made delight sound like devotion. The cantata "Unser Mund sei voll Lachens" (BWV 110) was first performed on Christmas Day 1725 at Leipzig's Thomaskirche. The opening movement, an adaptation of the overture from Bach's Fourth Orchestral Suite, combines festive trumpets and drums with choral writing that builds to the extraordinary laughter fugue, where the word "Lachens" (laughter) is set as a musical onomatopoeia with rapid, cascading syllables that tumble between the vocal parts. The effect is simultaneously sophisticated in its contrapuntal construction and viscerally joyful in its emotional impact. Bach drew the text from Psalm 126: "Then was our mouth filled with laughter, and our tongue with singing." His literal interpretation of the text was unusual for the period. Most contemporary settings of this psalm treated "laughter" metaphorically, through bright harmonies or quick tempos, rather than having singers actually produce laughing sounds. Bach's approach was characteristically audacious: if the scripture says laughter, the congregation should hear laughter. The cantata's six movements move from this communal celebration through intimate arias and recitatives reflecting on the meaning of Christ's birth before closing with a simple chorale that returns the congregation to the familiar comfort of communal song.