Use template strings for Vue templates.

js/main.js

@@ -1,10 +1,10 @@
 (function () {
 
 Vue.component('ghetto-sound', {
-    template: '<div class="btn audio-btn" v-on:click="click">' +
-        '<label>{{ asset.name }}</label>' +
-        '<span v-bind:class="[\'status-icon\', { playing: playing }]"></span>' +
-    '</div>',
+    template: `<div class="btn audio-btn" v-on:click="click">
+        <label>{{ asset.name }}</label>
+        <span v-bind:class="[\'status-icon\', { playing: playing }]"></span>
+    </div>`,
     props: {
         asset: Object,
     },