..No, nothing ever does. [He's not really thinking of Iroh so much as just knowing the pain of losing someone close to you. Everyone close to him, really. He understands. When he comes back to the conversation, he stutters for a moment before launching into his usual chipper self when talking of science.]

A-ah, yes, my theory. The theory! Yes! Every universe vibrates on its own frequency and scale - some a Major C, another - G. It is my theory that this universe - and the compound within which we reside - must be vibrating at several frequencies at once, a harmony, if you will, in order to compensate for the energy exchange necessary to bring a live human being from one world to another and keep them alive. This pocket universe - which would explain why time seems to stop for us at home while it carries on here - must be vibrating at such a variety of frequencies as to keep us all alive.

Now, by finding said harmonic frequency, it could be possible to better understand the mechanism that brings us here and sends us back. At the very least it could serve as an early warning if one frequency in particular begins to vibrate at a higher volume than the others - indicating either an entry or an exit of a person from that world. At best, it could help us move forward in the pursuit of going home.

Do you see? Isn't it wonderful? Music. Music is the key!