I've just started music technology and I'm really enjoying it and am so glad I came across your article. But the other day my teacher did this really trippy thing with us. He mentioned a few things Jeffrey Rosenthal did (sine waves, pressure, hrtz, frequencies) but he just played the E note and held it. (he said if we closed our eyes it might help) he then played a B and made us lock onto that note. Then when he played the E again he told us to hear the B within the E note he played. No one else heard it but i'm pretty sure I did. He did it a few times and towards the ending as the E note is trailing off it sort of sounds like the B note? He did this a couple of times and it got clearer and clearer. The other students just looked at us like we were crazy but I could definitely hear it! He then did the same thing but with the G sharp key and I sure as hell was able to pick up that note within the E as well. He then said that's what makes up the E chord. The B and G sharp you could hear within the E, when played at the same time makes up the E chord. He then went on to talk about flattening the G making minors and so on but he'd discuss that later... Anyways, does anyone else know what I mean? I felt this article gave the scientific reason why.