music.js

var file = require('file'),
    fs = require('fs'),
    musicmetadata = require('musicmetadata'),
    rootDir = '/Users/carlosmarx/musicfiles',
    SPACE = '\n',

    getMetaData = function (file, cb) {

	var result = {},
		parser = new musicmetadata(fs.createReadStream(file));

	parser.on('metadata', function(resultObj) {
		result = resultObj;
	});

	parser.on('done', function(err) {
		if (err) {
			cb(err);
		} else {
			parser = null;
			cb(null, result);
		}
	});
};

file.walk(rootDir, function (err, dirPath, dirs, files) {

	if (err) return console.log('Err:', err);

	var len = files.length;

	while (len--) {

		var currentFile = files[len];

		if(currentFile.split('.').pop() === 'mp3') {

			getMetaData(currentFile, function (err, metadata) {

				if (err) return console.log('Err:', err);

				console.log(SPACE, currentFile, SPACE, metadata);
			});
		}
	}

});