Task: Question Answering
Input (English): Passage: Critical opinion as to the merit of The Oceanides has been overwhelmingly positive, and today the piece is counted among Sibelius's masterpieces. Following the 1914 premiere, Olin Downes, the American music critic and Sibelius devotee, described the new work as "the finest evocation of the sea which has ever been produced in music", praising the composer for his "extraordinarily developed feeling for form, proportion and continuity". Downes furthermore assessed Sibelius's Norfolk concert as just the third time since 1900 that he had "felt himself in the presence of a genius of world class" (the other two being Richard Strauss in 1904 and Arturo Toscanini in 1910). An unsigned review in the New York Tribune (almost certainly penned by critic Henry Krehbiel) found the new work "fresh and vital, full of imagination and strong in climax". He continues:
Extremists will probably deplore the fact that the composer is still a respecter of form, still a devotee of beauty, still a believer in the potency of melody; but this is rather a matter for congratulation than regret ... Mr. Sibelius is a fine musical constructionist, an eloquent harmonist and a fine colorist despite his fondness for dark tints.
The influential Swedish critic Wilhelm Peterson-Berger, always a thorn in Sibelius's side and whom the composer had once mocked as "his lordship", required some three encounters with The Oceanides before warming to the new symphonic poem: after hearing the Stockholm Concert Society under Sibelius in 1923, Peterson-Berger at last embraced the piece. "The Oceanides was totally and completely different from three years ago under Schnéevoigt", he wrote. "In this beautiful poem one really heard something of the sound of the Aegean Sea and of Homer". 
Question: What is the full name of the person that warmed to the new symphonic poem after hearing it performed by the Stockholm Concert Society?
Output (English): Wilhelm Peterson-Berger.