Discourse forums (which is what we use here) support a number of sites, content from which will be embedded in the post as a onebox.
If you put the media’s URL on its own line, like this:
https://soundcloud.com/deus-ex-ost/unatco
Discourse will display the playable media onebox instead. Like this:
You can do this with Soundcloud, as above, but also with YouTube
and SlideShare
Wikipedia articles
and even tweets
https://twitter.com/pagerduty/status/869957648384483330
There’s more of course, but I just wanted to give you all an overview of how easily you can embed stuff, and hopefully provide some inspiration.