Only one has promised to hear our prayers and can answer them by the merit of His suffering and death: Jesus. We cannot have this confidence in praying to anyone else, as faithful, noble, or virtuous as they may have been. While we can remember the saints who came before in thanksgiving and encouragement and emulation, their prayers and good works cannot save us. Our confidence is in the Divine Promise of Jesus and in His merits. We want to be confident that our prayers are heard. That can only come from Jesus and His promise of mercy. 

The church sings the new praise song that it receives through faith through the Holy Spirit. We sing of Christ, the Lamb of God, sitting at the right hand of glory, whose blood cleanses us from all sins and sanctifies us to be the people of God. Everything the church sings in the faith will have this new song as its heart and foundation. Everything we sing and do flows from the confession of Jesus, the Lamb, whose blood washes and makes us clean. All faithful singing will sing of the faith we have received in the Gospel. 

1 For I want you to know what a great conflict I have for you and those in Laodicea, and for as many as have not seen my face in the flesh, 2 that their hearts may be encouraged, being knit together in love, and attaining to all riches of the full assurance of understanding, to the knowledge of the mystery of God, both of the Father and of Christ, 3 in whom are hidden all the treasures of wisdom and knowledge.