Well, I can hardly claim to be an Original Gamer, as I was only 1 year old when D&D was first published.
But we usually listened to music before the game, to help get us in the mood, but never during the game.
Stuff like:
Metallica - Ride The Lightning, Master Of Puppets, ...And Justice For All.
Slayer - South Of Heaven, Seasons In The Abyss.
Megadeth - Peace Sells...But Who's Buying, Killing Is My Business, Rust In Peace.
Queen - A Kind Of Magic (we were big fans of the Highlander movie, so it was a natural for us to listen to the unofficial soundtrack almost everytime we got together).
Iron Maiden - The Number Of The Beast
Dio - Holy Diver
Hell, that's all that I can remember off of the top of my head...though I do seem to recall that our DM was a fan of JBJ's Blaze of Glory, so we listened to that a fair bit, too.
Our snacks of choice were Dorito's (original or ranch) and Pepsi. Sometimes pizza if anyone had some spare money. Hell, I remember one time when we stayed up all night gaming, headed to the local bakery at 5 AM for donuts and chocolate milk, then went back to the DM's place and played some more before passing out.
Good times.