Unable to obtain ID3 tags from MP3s loaded into SWF

(TechNote) In Flash Player 9, the Sound.id3 property is not available when using Sound.loadSound (or its ActionScript 3.0 equivalent, Sound.load) to load an external MP3 file from a different domain than the Flash Player movie (SWF) file unless a policy file exists on the MP3 file’s server. The policy file must permit access by the domain of the SWF that is attempting to read ID3 tag information from the MP3 file.