The man with the trombone said, "It's about energy" and I think that's the basis for all that is. The electrons need energy to keep them in tune. Legends don't get captured more authentically than in this video but it's a serious and plodding study to get there. Perspective does this kind of thing well, though, and they've all paid dues to be heard. We should all stop and take a listen. You know what they say about "Harmony and me," right?