SoundCloud songs are delivered from SoundCloud.com
These songs are not stored locally on your server, but rather delivered from soundcloud.com when the listener plays them.
However they do have the feeling of being the same as any audio file that was uploaded directly to your site via the jrAudio module.
You can list and search on them the same. They will display very similarly. They have a comments section where discussions can take place locally on your server.