Download all MP3 files from a page, without having to click all the links. Works only in Firefox and Chrome. Safari doesn't work, IE is untested.

download-all-mp3.js

var config = {
  timeout: 0,
  batch: 5,
  count: 0
};

var init = function(cb) {

    if(!config.mp3List) {        
        config.mp3List = $("a[href*='.mp3']");
        config.splicedArray = [];

        for (var i = 0; i < config.mp3List.length; i++) {
          var obj = config.mp3List[i];
          $(obj).attr("download", $(obj).attr("href").substring($(obj).attr("href").lastIndexOf("/") + 1));
        }
    }
    if(cb) cb();
}

var batchDownload = function() {
    if(config.splicedArray.length > 0) {
      config.timeout = 1200 * config.batch;
    }

    config.count = config.count++;

    setTimeout(function() {

        config.splicedArray = config.mp3List.splice(0, config.batch);

        for (var i = 0; i < config.splicedArray.length; i++) {
          var obj = config.splicedArray[i];
          var mp3Link = $(obj).attr("href");
          console.log(config.mp3List.length, mp3Link.substring(mp3Link.lastIndexOf("/") + 1));
          $(obj)[0].click();
        }
    
        if (config.mp3List.length > 0) {
            batchDownload();
        }
        
    }, config.timeout);

}

init(function(){
    batchDownload();
});