The duties in the temple were daily not just on the Sabbath. We are the New Testament priests according to the book of Hebrews and our service is to be daily. Music, music, music. Believe it or not, music is the number one reason churches split and people leave the church today. Not baptism, not a women's role in the church, not the minister or some strange doctrine, but music.
People take their music very personally and rightly so.
Songs were a large part of the early churches and of Gods people since the beginning. Again lets look at some words that may help. Singing should convey victory, joy, freedom and Salvation, not defeat. Sing with your heart and let all that can hear that you really feel it. Hey, these are going up to God.