Wikipedia
Swanwhite (Sibelius)
Swanwhite'' (''), Op. 54, is incidental music for orchestra by Jean Sibelius for a play of that name by August Strindberg. It consists of a horn call and thirteen movements. Sibelius completed it in 1908 and conducted the first performance at Helsinki's Swedish Theatre on 8 April 1908. Sibelius drew from it a suite in seven movements, Op. 54a.