Anything is Violin (なんでもバイオリン Nandemo Baiorin), is a one of gadget owned by Doraemon.
Shizuka accidently broke her violin while she was practicing. In order to make her happy, Nobita ask Doraemon to do something good for her, So Doraemon takes out a "Anything is Violin" to make Shizuka happy again. Any object rubbed by this tool Will turn into like a sound of original violin, such as a racket, ballon, cotton candy, and even Shizuka most favorite food is Called Roasted sweet potatos.