"Oh, what a mess!"
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The Spider Chair is a device created by Sirrus on Spire during his imprisonment. The chair is powered using an exact amount of electromagnets floating around both the main and second palace. Too many electromagnets online results in an overload and power failure, while too little will restrict the chair from certain operations. The chair also acts as an elevator between the lower levels of the palace, the strings on the instrument, and the bomb factory.
The reason for the spider chair's legs are unknown, they are probably just for decoration. Sirrus originally constructed the chair to play music, but later adapted it to reach his bomb factory and create explosives, although it still possesses harmonic capability.