What song is heaven and nature sing called in the lyric?

The phrase "heaven and nature sing" is from the Christmas carol "Joy to the World," which was written by Isaac Watts and composed by George Frideric Handel. The line emphasizes the joy and celebration of the arrival of Christ, inviting all of creation to partake in the joyous occasion. The song is a staple during the Christmas season and is well-loved for its uplifting message.