He nods along less consistently and listens for - patterns.

This bit's in three, for a while, and is starting with this motif and expanding it out in what's at first kind of a facile way - but then the expanding keeps happening; it's the same meta-pattern as before, but it grows and bloats into near unrecognizability - she might be doing another exercise, here, more than making music per se.  She runs out of room across the high and low notes somewhere in (if he can count it) eighteenish beats per measure, and then she works her way back down to the original much more rapidly.

She tries a similar idea with her right hand, and then switches back to something more simple for both of them.  One could easily say it's in four, although it really has more of the feel of alternating bars of three and five, sometimes with one of those repeated for an extra bit of energy or emphasis, and -

It's not quite growing dark out, but apparently it's enough so for Cyllene that she's decided to make a ball of light, hovering warmly, two feet above the middle C.

"- ooh!"

"Is it hot?"

She waves a hand through it.

Poke poke.

It's a little warm.  Otherwise, it doesn't feel like anything.

"How long will it last?"

Shrug.  'I tell it or,' shuffle shuffle paper, to the letter about her uncle, 'I died.'

"Ah. Well, it will make it a little hard for me to sleep, humans normally prefer it to be dark to sleep, but it'd be convenient as anything for situations where we normally use candles."

'I can tell it'... where's the word there it is, 'stop.'

"The nice thing about candles is that we can move them, though there's plenty of places where a stationary light would be nice to have..."

She resumes playing.  It's not the same song as before, but he can catch a motif here and there if he's got the ear for that.

He lives in preindustrial times and music is one of the more interesting available things to do.

After several minutes Cyllene concludes the song and leans back.  The light bobs with her.

"It's going to follow you now?"

Nod.  (The light dips a little, with her, but moves less than her head does.)

"You don't think it'll just keep you awake?"

'I can tell it stop' ?

"If you can make it follow something else maybe a candlestick?" He goes and finds one and takes the candle out of it.

Oh, nod.  She's gonna play some more about this.

Is it like making it follow her was?

It has some motifs in common with that one instead of just in common with the first one.  But it's clearly a different song.

A few bars before the end, the light swoops over to be on top of the candle holder, somewhat higher up than people tend to make non-stationary candles.  It settles into place during the resolution.

"Beautiful. If you're not attached to it I'll see if they want it in the servants' quarters, they spend more of the night doing things than I do."