Relative pitch can definitely be trained. And I've heard people with perfect pitch say that when they hear a note they just relate it to a known note. Though I

Relative pitch can definitely be trained. And I've heard people with perfect pitch say that when they hear a note they just relate it to a known note. Though I don't know if that's true perfect pitch or a different means to the same end. Then again I've heard other musicians say that perfect pitch is like seeing colors. You and I just know red is red, they might just hear C is C.