Like you, InOBU, I "knew" Rick mostly through PMs and Mudcat posts. OK, in my case, entirely, except that I feel like I also know him a little thru his protegé Marion, whom I've had the pleasure of meeting and doing some music with.
I too feel his loss - but also still feel his presence because he genuinely touched my life for the better.

Happy Birthday, Rick.

Hope you're having a big ol' jam singing with the angels right now.

Genie