Then I'm glad I said something... maybe I can help. A contract is only as binding (as in "restrictive") as the contract language. You can (and probably should) have a clause in your contract that says that either you, the employee, or them, the employer, can end the contract with written notice provided two weeks in advance (or any amount of time you both deem is fair and reasonable).
Other than that, the purpose of the contract is to protect you and them, and is overall a very good idea. I highly recommend having one, personally.
Yea man, what she said. If you want clarity, then get a contract. Yall can negotiate rehearsals, number of sundays, number of hours expected, outside engagements , everything. Then you don't have to feel obligated to be there every time the church is open. Additionally, you'll know beyond a shadow of a doubt, when you ARE expected to be present and prepared.
if you are getting paid, then I would reccommend this highly. Now if you aren't getting paid, then you are rendering voluntary services and nothing is binding. You just let your yes be yes and your no be no.
Jlewis