Did anyone see "Breakfast with the Arts" this past Sunday on A&E? They were showing a small ensemble(SP?), not a full orchesrta, playing Bachs Brandenberg Concerto. Close ups of the bassist showed that he had some kind of markings on the neck, where the thumb is. Anybody else see that? I didn't see any markings on the finger board. Anyway I thought it was interesting. Does any one else use markings?