Starting on Music Collection 2.3 we've created a new comment plugin interface so any comment system can be embedded into Music Collection's pages.
Some of the most demanded Comment systems to include have been Facebook and Disqus, so we provide these two plugins out of the box on our subscriptions, so you can use them if you want to.
To include a comments system, simply install the plugin (provided on Your Orders) using the Joomla installer. Then be sure to enable the plugin, and set all its parameters the way you like.
You can have multiple comment systems enabled at the same time