Thanks for posting that, Dave! Marvin sounds great as well..
Geddy Lee has been doing the index-finger-only thing also now for quite some time. A guy I know from high-school days always played that way too, and could totally smoke me on the bass. Every now and again I get brave and try it, but can't even begin to pull it off with any dignity!

Jamerson makes it look so effortless..
John