Why do we stand when we sing?
Nehemiah 9:5 - "Stand up and bless the Lord our God for ever and ever; and blessed be Thy glorious name which is exalted above all blessing and praise."
Why do we clap our hands?
Psalm 47:1 - "O clap your hands, all ye people; shout unto God with a voice of triumph."
Why do we lift our hands?
Psalm 134:2 - "Lift up your hands in the sanctuary, and bless the Lord."
Why do we have audible praise unto God?
Isaiah 12:6 - "Cry out and shout, thou inhabitant of Zion; for great is the Holy One of Israel in the midst of thee."
Why are musical instruments a part of the worship service?
Psalm 150:3-5 - "Praise Him with the sound of the instrument; praise Him with the psaltery and harp. Praise Him with the timbrel and dance; praise Him with stringed instruments and organs. Praise Him upon the loud cymbals; praise Him upon the high sounding cymbals."