: Unlike many upbeat Christmas carols, this hymn focuses on the "O" of anticipation—a mournful yet hopeful cry for deliverance from exile. Musical Composition

: The verses reflect different biblical titles for the Messiah (e.g., Key of David, Dayspring), while the refrain "Rejoice! Rejoice!" provides a stark, major-key contrast that signals the shift from longing to fulfillment. Notable Modern Renditions

: Choral arrangements, such as those found on the Internet Archive , emphasize the communal, liturgical roots of the piece.

: Written in a minor key (typically E minor), the melody feels ancient and solemn. It lacks the sugary sweetness of modern carols, making it stand out as a piece of profound liturgical art.

: The lyrics are based on the "O Antiphons," which date back to the 8th or 9th century, while the familiar "Veni Emmanuel" melody was likely adapted from a 15th-century French processional for Franciscan nuns.

Critics and listeners often highlight different versions based on their production style: