So I'm watching the Marshall Tucker Band on the Midnight Special and admiring the Caldwell brothers thumbing techniques on their respective guitars. And then Tommy, on bass, quickly moves to a pick looking technique. Tone doesn't seem to change at all. What is that? Start at about 4:25 and you'll see what I'm talking about. Then he switches it up again in his solo at about 6:50. There's no pick. What is that technique? Long jam that had to probably fill out the remaining minutes of the show ......