When retrieving song keys, the following fields will be returned by default.
|id||string||The ID of the key.|
|date_added||datetime||The date the key was added.||Date is returned in UTC time.|
|date_modified||datetime||The date the key was last modified.||Date is returned in UTC time.|
|name||string||The name of the key.|
|key_starting||string||The starting key.|
|key_ending||string||The ending key.|
|arrangement_id||string||The ID of the arrangement.|