What are some recession proof jobs?

I know that almost every job is effected by recession, but what are some career paths that are always in need of new people? As of now, I am working on a pre-med degree as well as a history teaching certification.

I ask this because I want a stable career in case my whole opera singing gig doesn’t really work out. And being able to achieve my dreams as well as becoming a philanthropist are my prime concerns, so I need a decent amount of money.