I hate that game!
We bought it and at times I've got to shut it off because instead of playing their real guitars they'll play GH. The worst is my 10 year old son who has an $800 Ibanez hanging on the wall in his room but it does inspire. He already knew Iron Man but now he knows War Pigs and he's gone on to learn several more off of GH so it does work in reverse too. I still wish he'd practice more. LOL!
Vols, you mentioned Roy Clark and it brought something to mind concerning guitar greats. In the early 70's I was living in NC and although we were longhaired, dope smoking, hippie types into everything from Pink Floyd to huge Black Sabbath fans we also loved blue grass. At the time there were numerous blue grass events called Fiddler's Conventions and one special place was called Love Valley NC and we'd go as often as we could. Some of the most knock your arse down, jaw dropping flat pickin' I ever saw was from these chicken pickin' guitarists.
There is a music store north of us near Canton Ga. that on the first and third Thursday's of the month have what they call a "pickin' party" where blue grassers from all around will show up and play around the store until sometimes near midnight. One night when I had to work country band Little Big Town who is from our area showed up for the fun and my wife and kids said they could pick and grin with the best of em too. I have seen them live and they are good. Many folks also bring a covered dish so the eatin' is good also. It's as much a social event as anything.
Working nights I only get to go when my vacation works out but my wife takes our guitarists up pretty often and the best part is the old timers who know their craft love to sitdown one on one with the youngsters and teach them their pickin' secrets. And you think the metal world has shredders, you ain't seen nothing that these ole' boys can't do and do better in many cases.
Scratch,
If you ever get the chance, check out Everett Bros. Music Barn up in Swanee Ga.
We've been several times with our crew of hardcore metalheads and they love it. The folks there are great and if you happen to play bring your guitar, banjo, fiddle, mandoline because even if you don't know how they'll pull you up a chair and teach you how. Super, Super, Super folks! You'll hear everything from blue grass to downhome gospel music. Never came away not having a goodtime with good people!
Oh yeah! 
