I've not scrapped a regular piano, but I did recently scrap an electric organ. small, but fun. Definitely not worth the time, and better to pull the back off, snip the accessible wire, and burn the rest. Where I live, burning stuff is so common the fire dept. only gets called if people see a huge blaze in a small area. I have a metal fire pit, about 6 feet in diameter so I get away with all kinds of stuff. But the organ yielded lots of cool stuff. It was made in 1987, so it had some really nice paper cone speakers that I am saving. Some basic power regulating stuff like transformers and such, lots of brass and wire, and a lot of steel. But the most fun was not being able to find all the screws etc. and resorting to bashing it apart with a hammer. That was super satisfying. Nothing like beating the sh** outta something wooden. LOL