Nick & Simon and Roel van Velzen were replaced by Ilse DeLange and Ali B after their departures.
Talents are selected in blind auditions, where the coaches cannot see, but only hear the auditioner.
Nick Schilder of Nick & Simon announced during season 3 in 2012 that he would not be coming back after three seasons of the show, citing burnout being tied almost throughout the year with the show and touring engagements.
Roel van Velzen, another veteran of the show who stayed for the initial three seasons, announced he will not be sitting as a coach for a fourth time around.
Ilse DeLange and Ali B then joined returning coaches Marco Borsato and Trijntje Oosterhuis for season 4.