 He also reviewed music, without technical terminology but with intelligence and insight, for instance into the work of his friend Berlioz, who set six of his poems (c. 1840) as 'Les Nuits d'été'.Gautier's literary criticism was more reflective in nature, criticism which had no immediate commercial function but simply appealed to his own taste and interests.Later in his life, he wrote extensive monographs on such giants as Gérard de Nerval, Balzac and Baudelaire, who were also his friends – Baudelaire dedicated his "chef-d’œuvre" "Les Fleurs du mal" to him, describing him as "a perfect magician of French letters".