1) Bob Marley:
yeah, everyone knows jammin, but very few have ever heard the confrontation album. of course, marley is in the middle, there a lot of surprises out there of folks who know and love a lot of this music. sometimes it is as Macka B said, "and if them ever find some man on the moon i'm sure he will know a bob marley tune, everbody loves bob marley everywhere I go its the same old story, people of all nations they love the rastaman vibration.."
2) Jerry Garcia:
Jerry G is a household name, but I doubt few people have ever heard a jerry play a jimmy cliff song.... few have listened to the dead, even fewer have ever heard jerry g solo, but almost EVERYONE knows who they are, its sort of a shame, but it is the nature of the game when you are predominantly a live band..
3) Frank Zappa:
Many many people have heard this name, but they have absolutely know idea what it means, but then again, so do many zappa heads...