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:
(video lost when we quit Facebook)
The keys don’t ring yet because there are no insulators under them, no holes drilled, 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.