In the past , Brent Mydland was part of the Grateful Dead .
The other official members of the band `` Grateful Dead '' are Tom Constanten ( keyboards ; 1968-1970 ) , John Perry Barlow ( nonperforming lyricist ; 1971-1995 ) , Keith Godchaux ( keyboards ; 1971-1979 ) , Donna Godchaux ( vocals ; 1972-1979 ) , Brent Benjamin ( keyboards , vocals ; 1979-1990 ) , and Vince Welnick ( keyboards , vocals ; 1990-1995 ) .