Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Would it work well for back support on a bench to play piano?
Document: My season tickets seats are an aluminum bench. This chair works perfectly, it's the widest one can have a stadium chair. My neighbors at the game are jealous, this thing really does support the back and has cushioning on the bottom. It also holds your spot, which is especially nice on bench seating. I would highly recommend this chair!
We've finished one season of watching high school football using these chairs. I bought these chairs because my back was extremely uncomfortable when I sat for long times without (back) support. They are extremely comfortable, and I have no back issues watching the football games. The hook on the front goes under the stadium seating bench adding stability. They are sturdy chairs and as such they weigh more than your typical stadium chair. I would highly recommend this product.
I have bad back so sitting long time on stadium bench for couple of hours can be rather painful. This bench chair works well in that it has hook that you slide underneath the bench to hold the chair in place. The back support does good job of keeping my back from bending and allowing me to concentrate more on watching instead of being distracted.
Provides good support and comfort. Would like to see a spring clip on the bar that attaches to the stadium bench. The seat can wiggle loose over a few hours. Overall a good seat and a good buy.
Excellent seat, definitely an improvement over the padded seats I have been using for years. Have watched my kids play sports and now enjoying my grandkids playing sports and as my body doesn't sit as well as it used to, this really helps. Only improvement would be hooks/rings so a shoulder strap could be added.
I really like the idea of this stadium chair, its fairly comfortable and gives you really great back support. Its just a hair to bnarrow. Get the wider one and it should work great.
I found the chair to be excellent in everyway expected, From carrying it , to setting it up and last but most important very comfortable and stable. I bought it for my wife so she would go to our grandsons football games , with me because in the past she complained about her back bothiering her on those bench like seats and vowed she would not go to another game. So I found the solution and now I have company at all the games.
I have owned many stadium chairs over the years because of back issues. They fail rather quickly if you actually lean against the back. Might as well have sat on the bench with a cushion? This one is constructed of strong looking materials and appears as if I will get a longer than normal use from it.
My parents and in-laws love watching their grandchildren but the benches at each event are very tough on their backs. We thought these chairs would be an awesome gift. We even got the chairs in the school color. They work great on newer and older benches. They live them. Best gift in a while.
Comfortable base, and sturdy support for bench seating at events, and for use on our small aluminum outboard. Lightweight and easy to carry. I am very pleased and will be purchasing another!
Answer: yes