"I was actually wondering if the universe cares what tempo it's at."
"The most likely problem is that I can only produce illusions to the level of my ability to form a clear mental audition of the sound I want. I don't have to be able to, say, write it all out in harmonic dictation; but it has to be such that it would sound different to me if something were wrong. The other person I asked about this was Melian but she's a Maia - do you have the thing where you feel like you have a crisp memory of something but it turns out you can't count someone's freckles or, I suppose, in this case, how many voices there are in a chorus...?"
"What my illusions do is they produce a genuinely crisp image which would produce the same mental image I have. So it won't look blurry, because I would have remembered that; but any distinctions that don't affect my memory of the experience at all don't make it in, and any ambiguously memorized experiences could be distorted. However, once I've got an illusion I can treat it like an object without it having to go through my head; audio ones do this less, but I could still speed one way up, make it quieter or softer, 'store' it as two parts and put them together when I wanted to cast - it would have to be continually making noise, though I could wrap it in a buffer so nobody else could hear it."
"I can't think of a reason that wouldn't work. And as you must have picked up, the main advantage of Curufinwë's method over mine is that once completed it doesn't require action and time to activate. If making a building crumble with magic, which is something I can do, took a few seconds instead of an uninterrupted hour -"
"I'd still have to compose the music or get it composed, but if I could be around while someone sang it to 'record' it and it really is pure sound and not anything I can't perceive..."
"What's a good test for that, then, some relatively brief song that doesn't collapse any buildings that you could demonstrate and I could capture and try in illusion form...?"
She makes a gently spinning image of the globe of Midgard.
It takes a minute. At first it's just a typically pretty Elven song, and then it does begin to feel like it is lifting them out of the air around them, and the globe is spinning about half as fast, and there's a feeling vaguely like swimming through a current. He stops after a minute. "I can technically keep it up all day."
She records the song, quiet, piecemeal, insulating some of it from some more of it. "If it just repeats indefinitely will it keep working or does it need to proceed through a series of themes to keep working...?"
And she snaps the bits of illusion together.
It speeds up.
The speeded up spell makes the globe slow to a crawl.
"...I don't have that problem. Anyway, I could deploy a song spell at range, which I can't do with my usual set; unless there are so many items on the menu here that I'm not going to be able to keep them straight might as well listen to one."
"Not that many, especially since most of what I can do is even less useful. As far as useful things go. I can make people less tired. I can make anything that hits them hit less hard. I can amplify my voice. That's actually a very simple series that most people weave into other songs, but I don't know how you can do that. Playing both at one shouldn't work, if you have two people singing you generally get a competition for which effect takes."
"I can amplify the songs without a song for it, unless there's something special about increased volume from magic-derived sources."