I say this without a shred of hyperbole: nearly all the problems of contemporary Christendom can be traced back to a defective view of worship.

Even most of the best churches, that otherwise seriously believe the Bible, don't pay attention to what it says about worship.

What the contemporary church believes worship is for:

Evangelism
Outreach
Marketing
Entertainment
TEDtalks w/Bible verses
Theology lectures
Impressive rock concerts

What the Bible says worship is for:

God's people gathering before His presence
God renewing His covenant relationship with His people
God's people receiving grace from Him
God's people responding with praise
God's people returning a portion of the grace He has given

If you want a simple, one-sentence definition of what the Bible says worship is it is this:

GOD'S PEOPLE DRAWING NEAR TO HIM.

Read that again, and again, and again. THAT is what worship according to the Bible is.

God gave His people a pattern of how He is to be approached.

He CALLS us into his presence (Lev. 9:3-5).

He speaks, and we respond by gathering before His face.

Historically, this is where the "call to worship" is derived.