On the Feast of Theophany, during the sanctification of the water and the washing with the water, do we sing "Praise God" in the joyful tune or the annual tune? The book of the "Lakkan" is not clear on the issue. If we sing in the joyful tune, we must say "Jesus Christ the Son of God was baptized in the Jordan" which the book does not mention, whereas it does mention the Gospel response, for example.
The response of "Praise God" should be chanted in the joyful tune. The books are written by human being who may miss some points. Here comes the importance of Oral Tradition.