Many good musicians can do that, especially if they have a reference pitch (I have A-440 pretty much memorized from years playing in orchestra). The chord would

Many good musicians can do that, especially if they have a reference pitch (I have A-440 pretty much memorized from years playing in orchestra). The chord would take more time to reason out, but a standard chord (like the B-minor one you mention) would be quite quick. I sing with someone that has perfect pitch (not just good relative pitch like I have). He can immediately identify a note at random, but has a very hard time when we want to transpose a piece—he's never really had to learn how to figure out intervals.