Christmas is an annual holiday that celebrates the birth of Jesus. It refers to both the day commemorating the birth; and also the Christmastide season which that day inaugurates; concluding with the Feast of the Epiphany. The date of the celebration is traditional; and is not considered to be Jesus's actual date of birth. Christmas festivities often combine the observation of the Nativity with various cultural customs; many of which have been influenced by earlier winter festivals. "Hark! The Herald Angels Sing" is a Christmas hymn or carol written by Charles Wesley, the brother of John Wesley. It first appeared in Hymns and Sacred Poems in 1739. The original opening couplet was "Hark! how all the welkin rings / Glory to the King of Kings". The version known today is the result of alterations by various hands, most notably George Whitefield, Wesley's co-worker, who changed the opening couplet to the familiar one we know today.
One of the tunes originally used for the carol was also used as a tune for Amazing Grace.[citation needed] Wesley himself, however, envisaged his lyrics sung to the same tune as his Easter hymn, Christ the Lord is Risen.