Mike Kobluk , Joe Frazier and David Boise later left the music industry , Chad Mitchell released a number of solo albums before retiring from music .
Denver 's time with the trio became the springboard to Chad Mitchell 's highly successful solo career .
Mike Kobluk , Joe Frazier and David Boise later left the music industry , Chad Mitchell released a number of solo albums before retiring from music , and Denver 's time with the trio became the springboard to his highly successful solo career .