 Though Boulez separated the groups of players as far apart on the stage as possible, David Robertson, conducting the Orchestre National de Lyon at Carnegie Hall in 2003, placed some in the auditorium's balconies.In 2012 Alan Gilbert led a performance in New York's Park Avenue Armory, placing the groups "high and low all over the hall".Boulez based the tonal structure of "Rituel" largely on a set of seven tones, corresponding to the number of the letters in the name "Maderna".