Antiphonal Celebration is based on the tune Llanfair by Welsh composer Robert Williams (1781-1821). Llanfair follows a simple form (AABA), which is common to 19th century Welsh hymn tunes. The title Antiphonal Celebration describes the nature of this piece. It is a joyous festival work that utilizes a technique known as antiphony. Antiphony occurs when the trumpet section states a question phrase. The band then replies with an answer phrase.