I was hoping to have more than just the fortepiano as an accompaniment, and so that would perhaps be rather useful to set the scene. [he pauses to consider, playing through one or two possible chord progressions idly on the piano, before he nods to himself]

Yes, I think that would be a proper addition. And perhaps an additional chorus with the aria during the scene, if we have enough singers. [he's already pulled out a pencil and is about to start making notes on the music when he pauses, and pulls back]

Ah, forgive me. I'll notate this later, seeing as I've interrupted your practice time. [he tucks the pencil away again, moving to start gathering up his music] Which I assume you'll want to get back to. [said with a bit of levity]