Psalm 95:1-3

O come, let us sing unto the LORD: let us make a joyful noise to the rock of our salvation. Let us come before His presence with thanksgiving, and make a joyful noise unto Him with psalms. For the LORD is a great God and a great King above all gods.

Singing is a fitting act of worship. Worship of God requires a joyful spirit that pours out praise. Praise is a worthy sacrifice. Blood is necessary in so much that our flesh and blood are to be living sacrifices to God. Part of what it means to present our bodies living sacrifices is to praise God in singing.