I took a little time tonight to lay out a near-full keyboard on some telephone wire just to see how the 2-½-octave range sounded:

The keys don’t ring yet because there are no insulators under them, ed no holes drilled, search no resonators to catch the sound yet, and it still needs a final tuning. But everything sounds solid so far.

Looks like I need to finish it up with a D at the high end. I’ll probably cut some more for the low end just because they sound so rich and I think I can keep going down before the metal’s native harmonics overwhelm each key’s primary tone.