premise: A member of the Grateful Dead was Tom Constanten.
hypothesis: Grateful Dead . The other official members of the band are Tom Constanten ( keyboards ; 1968 -- 1970 ) , John Perry Barlow ( nonperforming lyricist ; 1971 -- 1995 ) , Keith Godchaux ( keyboards ; 1971 -- 1979 ) , Donna Godchaux ( vocals ; 1972 -- 1979 ) , Brent Mydland ( keyboards , vocals ; 1979 -- 1990 ) , and Vince Welnick ( keyboards , vocals ; 1990 -- 1995 ) . Tom Constanten ( born March 19 , 1944 , Long Branch , New Jersey , United States ) is an American keyboardist , best known for playing with Grateful Dead from 1968 to 1970 .