WOW! Doyle Lawson. Who would have thought there would have been a Quicksliver playing Bluegrass? Quicksilver Messenger Service was one of San Francisco's original psychedelic bands of the late 1960s. My association with Big Hats was "Mad Hatter", a name often given to one in the art of Hat Making. The Mercury used in the process made them crazy. Quicksilver is another name for Mercury.