Madetoja began to compose his Third Symphony, Op. 55, and upon returning to Finland in October (due to financial worries), his work on the project continued. The new symphony received its premiere in Helsinki on 8 April 1926, and although Madetoja received the usual praise, the audience and critics found the new work somewhat perplexing: with the monumental, elegiac Second Symphony having set expectations, the optimism and restraint of the Third came as a surprise, its (subsequent) significance eluding nearly everyone. Some years later, the French music writer, Henri-Claude Fantapié, described the cheerful, pastorale Third Symphony as a "sinfonia Gallica" in spirit and explained the premiere as thus: "The listeners expected the opera [The Ostrobothnians] to be followed by a nationalistic anthem and were disappointed to hear something that seemed to them to be hermetic and that, to crown it all, was lacking in pomposity and solemnity … the properties the majority of Finnish music-lovers always expect in a new work." Nevertheless, today the Third Symphony is widely regarded as Madetoja's "masterpiece", the rare Finnish symphony equal in stature to Sibelius's seven essays in the form. While on his way to Paris in 1925, Madetoja had met a music publisher from Copenhagen, Wilhelm Hansen, who placed him into contact with the Danish playwright Poul Knudsen. A libretto for a new ballet-pantomime, based upon "exotic" Japanese themes, was on offer and Madetoja accepted the project with alacrity. Having outlined his plan for the new commission while staying in Houilles, Madetoja he more or less composed the Third Symphony and Okon Fuoko simultaneously, although the pressure to complete the former was so great that Madetoja was compelled to place the ballet-pantomime aside until December 1926. Although Madetoja completed the score in late 1927, scheduling the ballet-pantomime's premiere in Copenhagen proved difficult, despite the enthusiasm of the chief conductor of the Royal Danish Orchestra, Georg Høeberg, who after a test rehearsal had proclaimed the score a "masterpiece". The primary cause of the delay appears to have been the difficulty of casting a lead actor, as the part required both singing and miming; Knudsen insisted upon—and opted to wait for—an actor then on leave from the theatre, Johannes Poulsen. The production languished unperformed until it (finally) received its premiere on 12 February 1930, not in Copenhagen, but rather in Helsinki, at the Finnish National Opera under the baton of . The performance was the