Frederick Stock (Friedrich August Stock) (November 11, 1872 October 20, 1942) was a German conductor and composer. Conductor of the Chicago Symphony Orchestra from 1905 to 1942. My favorite conductor after Mengelberg and Stokowski.
The Swan of Tuonela was originally composed in 1893 as the prelude to a projected Wagnerian opera called The Building of the Boat; Sibelius revised it two years later as the second of the four sections of the Lemminkäinen Suite (Lemminkäis-sarja) , also known as the Four Legends from the Kalevala, Op. 22, which was premiered in 1896. Sibelius revised the tone poem twice: once in 1897, and again in 1900.