I've been shooting ballets and performances in a symphony hall for a couple of years and have a lot of images. I shoot the performance onstage, as well as document the musicians and what's going on backstage.  I'm trying to figure out what would be the best way to try and sell these as stock.

I have model releases for most of the images. But since this falls outside of typical stock, I'm not sure what options I can use these images for.

Would Alamy or Getty be the best option or are these type of images usually not sellable?