My experience is differnt to Mark Clark's. In my experience, few know the name Duelin Banjos. I've said this before - it starts off "Do you know that film"... At least that's how it has worked for me. It's certainly popular and often requested though. I don't think Foggy Mountain Breakdown is too well known over here (UK) outside of folk circles. Ballad of Jed Clampet is the other I've been asked for quite a few times ("That Beverly Hillbillies tune").

I'm not really clear what Martin Gibson means by a banjo hit. There is quite probably things from both the Dubliners, e.g. 7 drunken nights and maybe something from the Pogues for example that made the UK charts but to me, the banjo would have been an accompanying device rather than a main feature of the song.