The following was excerpted from an April 10, 2011 blog post on ChrisRowbury.com that can be found here. Share your thoughts in the comments section below.
From personal experience, I find that working on my own with more than 70 singers at a time is very tiring. I don’t know why it should make a difference that there are 20 singers in each part instead of 15, but it does.
The maximum number of singers you can work with also depends on the space available and how you work. Obviously a larger room can take more singers, but even a large space might be too small if you need to do lots of moving around. If you work with the singers seated, you can squeeze more people in.
The singers also need to be able to hear you clearly, so even if you think you can work with 200 singers, there might be trouble ahead if you’re in a large hall with no amplification.
When you start out with a new choir, you may think that bigger is better, but there are definite pros and cons to having a large group.