Worship is how we thank God for who He is and what He has done in our lives. It reminds us that He is God and we are not. To discover who we worship all we need to do is look to who or what has our heart's affection and our mind's attention.
It certainly includes singing, but is not limited to musical expressions. What kind of spouse, parent, friend, employee, employer, boss, coach you are is directly related to how and who you worship.