The question essentially asks whether it compiles or not, and I said no because of the way the "sounds" are referenced. The variable a is never initialized, but is used to access the enum values. Is it always okay to access static members through a reference variable that was never initialized? Thanks!
In the case of an enum, you can't initialize it yourself. You can't call the constructor of an enum. The enum is implicitly static, and when initialized, the constructor is automatically called for each entry in the enum.