Wikipedia
Luonnotar, Op. 70, is a tone-poem for soprano and orchestra, completed by Jean Sibelius in 1913. It was dedicated to Aino Ackté, who premiered the work at the Three Choirs Festival in Gloucester, England on 10 September 1913, with an orchestra conducted by Herbert Brewer. Sibelius arranged it for voice and piano in 1915.
Luonnotar is based on Finnish mythology, the words coming from the Kalevala. The text is from the first part of the Kalevala and deals with the creation of the world. Luonnotar is the Spirit of Nature and Mother of the Seas. Setting music to Finnish texts was relatively new to Sibelius, as his first language was Swedish and most of his earlier settings had been to Swedish texts (except Kullervo in 1892, which is entirely in Finnish).