I found, that the third symphony of Jean Sibelius had been performed for the first time on 25.09.1907. Could You tell me, was the conductor Jean Sibelius or Robert Kajanus? And what was the name of Helsinki Philharmonic Orchestra on 1907? What was the concert hall in 1907 and where was it situated? Yours respectfully.
Symphony No. 3 was premiered 25.9.1907. The concert was held in the festive hall of University of Helsinki. Jean Sibelius himself was conducting (the whole program was his music). The name of the orchestra was at that time "Helsingin filharmonisen seuran orkesteri", Orchestra of the Philharmonic Society of Helsinki.