Steve Baughman has a very good video on you tube, however he makes an offensive and inaccurate remark about Travis picking, calling it Prince Charles picking.
he is in fact referring to PIEDMONT PICKING of the style of EttaBaker SamMcGhee, Missippi JohnHurt, which is in fact American not English.
in fact what he calls clawhammer should really be called Frailing guitar , as very often clawhammer banjo has very little bum ditty, and is often strumless or with very few strums.
here is a link to a very good videohttp://www.youtube.com/watch?v=TIPj2281hn8
mind you those tunes can also be played carter style with thumb melody, using a bum ditty thumb[ty] movement being replaced with a quick pick up on the 1 st string instead of the 5 string, or Pete Seeger banjo bum ditty up picking, the dgdgbd and dadf#ad are great for this.particularly[imo] dadf#ad