实验性
Music metadata declared on a sound definition. Each field is optional and is undefined when the sound definition does not declare a value for it.
可选
Artist declared for this sound. Undefined when no artist was declared.
Genres declared for this sound. Undefined when no genres were declared.
Moods declared for this sound. Undefined when no moods were declared.
Title declared for this sound. Undefined when no title was declared.
Music metadata declared on a sound definition. Each field is optional and is undefined when the sound definition does not declare a value for it.