«Among the most important contemporary composers Niccolò Castiglioni is one who, through his spontaneous experiencing of the musical material, personifies the romantic concept of «genius» at its best: he is one, who through his simplicity, sincerity and merritment, sings praises of the wonders of an enchanted and fairytale like nature, which the "lay" person with deeply-felt humanity and mystical devotion can participate in.»
Renzo Cresti in "Linguaggio musicale di Niccolò Castiglioni, 1991