bool: Is the speaker playing radio?

def is_playing_radio(self):
        """bool: Is the speaker playing radio?"""
        response = self.avTransport.GetPositionInfo([
            ('InstanceID', 0),
            ('Channel', 'Master')
        ])
        track_uri = response['TrackURI']
        return re.match(r'^x-rincon-mp3radio:', track_uri) is not None