The rolling desk idea is brilliant, I do wonder how often the configurations are shifted around though.
https://secure.wikimedia.org/wikipedia/en/wiki/Power_cord
https://secure.wikimedia.org/wikipedia/en/wiki/Power_chord
I assume electric guitars are not involved[1].
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[1] Although Gibson do make an Ethernet capable guitar: http://guitarist-gear.blogspot.com/2006/04/gibsons-ethernet-...