We can only take one set of choir information for each account registered so you can either register multiple times with different email addresses (possibly useful if you need to keep the purchases made for each choir separate), or register once and pick which choir to register with.

If you run choirs of different sizes, it may make more sense to register the smallest one as you won’t be forced into purchasing more copies than you need, but you can buy additional copies for your larger choirs when you need them.