WHAT SONG CONTAINS THE LINE LETS BE JOLLY AND DECK THE HALLS WITH BOUGHS OF HOLLY?

The song that contains the line "let's be jolly and deck the halls with boughs of holly" is "Deck the Halls," a traditional Christmas carol. The lyrics celebrate the festive spirit of the holiday season, encouraging people to decorate and be merry. The song is often sung during Christmas celebrations and is well-known for its joyful melody.