What are the most popular collaborations that Janis Elspas has participated in?

I'm sorry for any confusion, but I couldn't find specific information about collaborations involving Janis Elspas. However, I can share that Rebecca Elspas, a soprano soloist, has performed with the all-female a capella group Mezumenet at the University of Maryland. She has been part of original parodies like "The Rabbi's Son" and a funny mashup song from "Beauty and the Beast".

Would you like to know more about these performances or is there something else you're interested in?