When I play in a chamber music group, you can be put with many different personality types. I have been with players who are very shy and quite and won’t give their opinion or ideas, then there are those who take complete control and make the decisions for the group. In both of these situations you should take some control of your group, making sure rehersals are going the way you want also. Here are some pf my tips.
When the others in your group are shy and won’t make decisision about what to rehearse, you must be th one who keeps the rehearsal going. I know that you don’t want to seem like the tyrant type of leader, but continue to check in with them and ask if they have any new ideas or sopts they would like to work out. If you don’t take the leadership role in this situation, your rehersals will be spent doing nothing. As long as you continue to make sure your group mates are content with your choices as leader, this approach works very well.
If a member of your group is trying to take the lead, that can be ok. Sometimes you should let someone else step into the leadership role if they want. The problem comes in when they begin to ignore your ideas, or make derogatory remarks. In this situation, it is imperative that you tell the leader that you value his/her ideas but that you have some suggestions to that you think would improve the group. If the musician is taking over as leader, they obviously want a good performance also, so you can use that knowledge to bond together and try to become a more unified group.
If you haven’t worked witht the groupd for very long, these are just tendencies that come up that can be worked out over time. I hope these tips helped you to deal with difficult personaliy types in your own chamebr music rehearsals.