Yes! It's when you can relate to something.

Yes, generally it's the same metaphor.

Well, as Vlad says, they are even the same metaphor. :) It's a little stretched as that, though, as a chord is a combination of two notes and a simple resonance is a single note. But, heh, musical metaphors for things that go together, work well together, can be related. Hope these answers strike the right chord, resonate with you. :)

Yes, even the explanation in dictionary are also similar😄

Similar, honest:)