I sympathize with you. I actually go through this almost every sunday. Our " minister of music" is an old skool player herself. She is also a show off in front of a crowd. I remember my first time playing with her, our choir had to sing in detroit. She was being real direspectful about the church size. So, she could not fit in the area the organ was ( it was ample space) so she yells out " thank God for the renovation". She then goes to the piano. She is playing the song. Since I did not know it, I kept a solid tempo. She gets up from the piano, leaving me playing solo on the drums and was doing too much. The next thing you know, she trips over a monitor. I did not laugh then, but when I got home, It was a wrap.
Anyway dude, I know what you are going thru. Talk to your pastor and let him know your vision for the music ministry. Share your thoughts. Suggest to the Pastor that he holds a meeting with your staff. Keep praying, stay faithful and humble. My churches " minister of music" Cant keep time, plays like she is stuck i the 30's. No lie. I use to get real mad and people could see it. So Now, I pray as soon as I sit on my set and ask God to hide me from myself, and that I dont get in the way and miss the shift of God because I am pissed at a "colleague". Just know that David was annointed to lead at an early age, BUT God did not allow Davids reign to take place until it was time for Solomon to exit. Young man just know as a fellow levite I know where you are coming from, But dont let your frustrations during service cause you to miss the shift of God. If the levites miss it, then it was no point for us to even minister. I hope his helped.