I agree, great answers.
A good friend of mine is the MOM and P&W leader at her church in Vegas. Their purpose as given by the Pastor is to set the atmosphere for hearts to receive the Word. Their church's mission is focused on reaching the unchurched population in their area. This demographic does not want to stay in church all day, if you want them to come, you have to be cognisant of this. She is anointed to do what she does, and has to be very in tune with the Spirit as far as song selection, duration, etc. Their job as a team is to bring everyone's mindset into worship and to prepare their hearts to receive what the Lord is going to speak through the minister for that day. She told me if the atmosphere is right after one minute of one song, then they sit down and the speaker immediately gets up. Announcements, offering, etc. is done after the Word has gone forth and the altar call is finished.
I love visiting this church, I think they understand their purpose and where they fit as far as ministry, and they are focused on doing it well.