In the last major work of his life, Prokofiev filled his Seventh Symphony with music of disarming innocence and simplicity. He began composing it for a children’s radio program, and even as it expanded into a full-throated symphony it retained a childlike sense of wonder. Sibelius, the proud son of Finland, channeled his austere Nordic sensibilities into his Violin Concerto, which spans from an icy tremble to a pounding dance once dubbed the “polonaise for polar bears.” Don’t miss the return of violinist Aleksey Semenenko, who “played with deep sensitivity and chamber-like focus” in his last Seattle Symphony appearance (The Seattle Times).