The best 'band' practices is best manifested away from band time...
The daily, personal, intimate, secret life.
After being with the music ministry for a number of years, this is what I found out. No matter how we required them to attend things we do to supposedly prepare the team, kaming mga kuya would soon find ourselves astounded with problems our team face. I though kulang sa discipleship, or bible study, or what not. So we planned more, had cell group more, did spiritual enhancement seminars/walks/etc.
Still, those problem surface. Surprisingly, I've met a pastor who is a great worship leader and had been active in many church music teams, told me that he found some of the most hypocrite christians to be members of music teams. He said, the apparent 'flow' and success of the music and performance makes them think 'tis the flow of the Spirit, and it became a cover for their unrepentant, carnal lives.
Until I saw this anecdotal situations: a music minister who honors his mother and father has no problem honoring the sanctity of music ministry, while a church musician who views internet porn in the wee hours of morning will need to be busy with church work so that probably he won't give in to the temptation. You get the idea. The former, though there be few or sporadic band 'spiritual' preparation, would have no problem worshiping. The latter, would soon be on another round of counselling, absenteeism (due to guilt), vicious warm-cold cycle, etc.
Not to say the latter have no hope, I've seen some get back up. Nor do I intend to troll or rain on this post. What I'm saying is, if you truly desire to be a blessing to your band, be sure you're a blessing to the Name of Christ even in your personal, intimate, secret lives.