The Choral Arts New England calendar is a great resource if you'd like to learn about patterns and statistics — and if you're interested in learning if a particular work has been sung (much), or what your favorite soloist is doing. You can get charts (as well as numbers) of the number of events at any time during the year, for the past five years. You can also search the calendar to find performances of interest during that time period.
“I have an idea that people join choruses to experience self expression and also the oneness of a number of humans all and together looking for the highest expression of a big thought in music. Maybe we can never go all the way with a man like Bach, but we can go further with him than we could ever go on our own.” —Alfred Nash Patterson