Let’s define the word ACT. An act, when used as a verb, means to take action; do something, behave in the way specified.
Relating this to worship, I’d say that the true act of worship is worshiping in the specified way. This brings me to the question….what is the specified way?
Our answer is in John 4:24. It says “God is Spirit, and they that worship Him, must worship Him in Spirit and in Truth.
The true genuine act of worship is one that flows from the Spirit, and that is also done in truth
I can also say that true worship is NOT worship in Flesh and falsehood.
An art is the EXPRESSION or APPLICATION of HUMAN creative SKILL and imagination, typically in a visual form such as painting or sculpture, producing works to be appreciated primarily for their beauty or emotional power.
So, I can say that the Art of worship is the application of human creative skills/understanding,/knowledge/ability and imagination to produce “Music/worship/songs to be appreciated primarily for the beauty/emotions/acceptance/fame/popularity and what have you.
So, simplifying both, let’s just say that The true ACT of worship is rooted in “SPIRIT and in TRUTH”. However, the true art of worship is rooted in human reasoning (flesh), skills, abilities, wanting to be appreciated, wanting to be celebrated, and all of that.
I could also say that the ART of worship is rooted in emotions too. That’s why we have so many “EMOTIONS ON DISPLAY” during worship, instead of true brokenness, transformation, connection with the Spirit of God.