I got my MBA mid-career but my undergrad was in music and I switched careers 10 yrs out of college. So, while I'd amassed a healthy amount of business knowledge

I got my MBA mid-career but my undergrad was in music and I switched careers 10 yrs out of college. So, while I'd amassed a healthy amount of business knowledge, the MBA taught me things I'd not learned on the job. That said, for many in my MBA cohort who had majored in business in undergrad, most I talked to said they weren't learning anything they didn't already know, save perhaps how to use their financial calculators in novel ways. Lends credence to the 'signaling' of an MBA, more than anything else.