def download(self, url):
        """
        Downloads a MP3 file that is associated with the track at the URL passed.
        
        :param str url: URL of the track to be downloaded
        """

        try:
            track = self.client.get('/resolve', url=url)
        except HTTPError:
            log.error(f"{url} is not a Soundcloud URL.")
            return
        r = requests.get(self.client.get(track.stream_url, allow_redirects=False).location, stream=True)
        total_size = int(r.headers['content-length'])
        chunk_size = 1000000
        file_name = track.title + '.mp3'
        with open(file_name, 'wb') as f:
            for data in tqdm(r.iter_content(chunk_size), desc=track.title, total=total_size / chunk_size, unit='MB', file=sys.stdout):
                f.write(data)
        return file_name
Downloads a MP3 file that is associated with the track at the URL passed.
        
        :param str url: URL of the track to be downloaded