Attributes with Multiple Values
Some of the predefined attributes can have multiple values assigned to them. For example, Artist is an attribute that can have multiple values. You can call IWMHeaderInfo3::AddAttribute multiple times to add as many Artist values as you require. If you make multiple calls to AddAttribute for attributes that do not support multiple values, the method may return an error code, or simply ignore your request.
The following table lists the attributes that support multiple values. Some attributes can have multiple values only in ASF files, while others can have multiple values in both ASF and MP3 files.
|Attribute||Support for multiple values|