function handleFiles(files){
           if(!files.length){
               fileList.innerHTML = "<p>No files selected</p>";
           } else {
                var form = document.forms.namedItem("uploadForm");
                var formData = new FormData(form);
                var file = files[0];

                showMetaData(files[0]);
                formData.set('fileElem', file);
                getAlbumCover(file, function(cover){
                    formData.set('imageElem', cover);
                });
           }
         }


        function getAlbumCover(data, callback) {
            musicmetadata(data, function(err, result){
                if(err)
                    console.log(err);

                var picture = result.picture[0];

                if(picture){
                    var albumBlob = new Blob([picture.data], {'type':'image/' + picture.format});

                    callback(albumBlob);
                } else
                        imageList.innerHTML = '<p>no image in meta data</p>';
            });
        }



--------upload Post route-------
    var manageUpload = upload.fields([{ name: 'fileElem', maxCount: 1 }, { name: 'imageElem', maxCount: 1 } ]);
    app.post('/upload', manageUpload, function(req, res){
        post = new Post();

        User.findOne({ username: req.session.user }, function(err, newUser){
            if(err) console.log(err);

            post.audioFile = req.files['fileElem'][0].filename;

            if(typeof req.files['imageElem'] !== "undefined"){
                post.imageFile = req.files['imageElem'][0].filename;
            }

            post._user = newUser._id;
            post.title = req.body.title;
            post.artist = req.body.artist;
            post.start = req.body.start;
            post.stop = req.body.stop;
            post.genre = req.body.genre;
            post.tags = req.body.tags;

            post.save(function(err, newPost){
                if(err)
                    console.log(err);
                if(newPost){
                    res.redirect('/');
                }
            });
        });
    });