I'm a part of our Praise and Worship team. The very name of this ministry suggests a type of leadership. The function of a Praise team is to lead the congregation into accepting the music as a bonifide form or worship pleasing to God' not simply a form of entertainment. If people want to be entertained, they should stay home and watch the boob tube.
Honestly.
Now to the point; as long as the rules are meant to bring the Praise team together so they may lead with the proper state of mind, I don't see an issue.
Some guidelines for rules should be; (this by no means is carved in stone, but exceptions should be limited)
Attendance- members of the team should come on the designated date and time or else not take part in Worship Service. God just doesn't like a lukewarm, unprepared hearts.
Rehearsals- Very important that you know the music you are playing and that the lyrics present the opportunity of right worship. This just cannot be done if rehearsals aren't taken seriously and members are going through the motions. If you need to go through a song three or four times to iron out the wrinkles and get it right, so be.
I'll take myself out on Sundays if I can't make rehearsals unless I know the songs well and no changes have been made to the arrangement.
God's not looking for perfection from us but He does expect we give it the best we got.
Song selection - Now I know this can be suggestive, but please keep in mind Romans 12:2 when selecting songs. There are some good contemporary Praise and worship songs out there and there are some <cough> Contemporary Christian songs that just have no place in a Worship service.
It's very easy for Praise Team members to fall into the habit of suggesting songs based on their likings and not really praying over whether or not they are Service-worthy.
I will take songs like Old Rugged Cross, Soon and Very Soon, Just a closer walk With Thee, It is Well (with my soul), etc., over anything I hear on the radio. Many of the older Gospel songs can be worked with a bit, meaning you can play with the arrangement a little, maybe change the tempo or even the beat, making them sound fresh but still not come across like some loud Rock band on stage.
I'm usually the loudest voice of opposition when it comes to too much contemporary stuff. I don't believe the Church needs to change it's "style" to attract a younger crowd. It's God that draws people in anyway. I say let them learn and like the older stuff.
The good ol' tunes have so much more meaning and theology in their lyrics.