Thanks for the info, but I was meaning in a musical instrument sense-how does it sound compared to other woods.nothing really wrong with it. light weight, not very hard, light coloured, not much for grain pattern. Around here anyway, the life span of a poplar is only about 50 years and they rot from the inside out. Big ones might be hard to come by. But if you find a good one, no reason it wouldn't work for an electric. About as hard & heavy as pine.
Also, they are the favored species of the pulp mills so that's usually where they end up.
In Washington state, all the lumber stores sell poplar 1x's in widths right up to about 12" and some 2x's as well. We just don't see them here in the stores.