Who stipulated it? I guess I don't want to sign on the panel for personal reasons. But then again, if it's really expensive, I won't let people scribble on the panel. On the other hand, if it is an ordinary piano or poker, a minor celebrity can't afford to lose that person. It's really hard to lose face. I'll sign a small one for you in the corner and pay.

In addition, the signature on the panel is generally the signature of the manufacturer of the piano on the LOGO of the sound hole; Either the user or the owner of the piano should be famous. When transferring the piano, the transferee will make it sign for some reason.