My familiarity with the music of Sibelius is nothing to write home about. I have these recordings which could use some airing out:
Pelleas and Melisande suite, Charles Mackerras conducting.
Kirsten Flagstad, songs, London Symphony Orchestra.
The Tempest incidental music, Sir Charles Groves, Royal Liverpool Philharmonic.
Ormandy - Four Legends from the "Kalevala". Also have it conducted by Lukas Foss.
Heifetz and Shlomo Mintz playing the violin concerto.
Ormandy - the first symphony.
Koussevitzky, Monteux, and Paray doing the second symphony.
Alexander Gibson doing the fifth, London Symphony Orch.
Well, it's a start.