It is where man tries to make the Gospel message more relevant in their expression of music in the church.
If the worship leader strums a certain chord on the guitar, or plays the piano a certain way, the Gospel will work better.
The problem is that we cannot make the Gospel more relevant. If we believe we can, then we are making ourselves an extension of what Jesus Christ has already done on the cross and we become the "Saviour" instead of Him.
"Contemporary worship" is about man, true worship is about God.
Gimmicks bring in money, spectators, and fee-goods; true worship glorifies the name of Jesus Christ with the result of changed/ transformed lives.