Merriest is the correct spelling.
The melody that is considered to be the most merriest can be found on various websites like WSJ and ReptilisRex. There is not really a specific melody that is the merriest, but more like a list of songs considered to be the merriest melodies.
comparative - merrier superlative - merriest
Merriest is the correct spelling.Some example sentences are:He is the merriest chap I know.I wish you the merriest of Christmases, good sir.
Those letters will spell the Christmas word presents. You can also spell the non Christmas words pertness and serpents.
christmas
Christmas -> Noël
Christmas
Nochebuena= Christmas eve
merrier merriest
merrier, merriest
merrier, merriest