Vince has good insights, I think. What was it that God asked of Adam in the Garden? Obedience. That's the hallmark trait of a God follower. But obedience of the heart is in itself an act of worship. In Hosea 6:6, God says "For I desire steadfast love and not sacrifice, the knowledge of God rather than burnt offerings." 

How often do we offer up empty hymns and songs without our actual daily obedience? I honestly believe God wants our obedience to Him and His word, acted out in love. We all know what that's like. When we are in tune with Him, our worship flows so much more freely and passionately. 

Obedience must proceed worship or it is empty.