First off... Matt Heafy of Trivium (never met him) seems like a really nice guy. He's very involved with his fan base, especially on Twitch.
Richard Marx seems like... I'm not sure. The dude's a total SAVAGE on Twitter, and it's pretty hilarious to watch.
Matt Heafy produced a track with Richard Marx on vocals, with a heavier side - keeping it a ballad.
I'll be honest. I do not like it. But c'mon, give it a listen.