Hello Musicjunky and welcome to the forum.
There's certainly lots of interesting stuff sound and music wise in audiogames, and I'm glad your enjoying bk3 etc, I also always have a soft spot for entombed myself since I was on the early alpha testing team for it.
I would also highly recommend rhythm rage if your into music too, any questions about games or the forum feel free to ask.
@Bigbeast greetings and welcome.
Thankfully we have a good few online games now, from crazy party, to social hubs like Quentin C, RS games and Huboodle on Ios, and of course lots of multiplayer doomy fun in Swamp and redspot, so hopefully you should find something fun.
I personally enjoy a good few muds myself when I'm looking for a multiplayer experience, though I admit I'm an rpg fan.
As again, any questions feel free to ask.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)