The term 'Merry Song' can be broken down into two crossword solutions: CAROL (5 letters) and LILT (4 letters). A CAROL is a festive song, usually associated with Christmas, that is typically sung by a group of people. The word 'CAROL' is derived from the French word 'CAROLE, ' which means 'dance in a circle.' A LILT is a light, cheerful tune or melody. It is often used to describe a type of singing that has a gentle, swaying rhythm.