The armonica is a truly beautiful instrument, but in terms of technical difficulty and impressive performance I still much prefer original many-cups-of-water glass harmonicas/harps: https://www.youtube.com/watch?v=QdoTdG_VNV4
Definitely. Another cool example that has some impressively fast passages, and also a novel sort of vibraphone-esque table-shaking technique: https://www.youtube.com/watch?v=lAEXH9DAH98
