Strindberg's Eerie World Of Lost Souls
https://www.nytimes.com/2001/06/22/movies/theater-review-strindberg-s-eerie-world-of-lost-souls.html
A review of a 2001 production of the play in The New York Times.
Glenn Gould - Beethoven, Piano Sonata No. 17 in D minor op. 31/2 "The Tempest"
https://www.youtube.com/watch?v=RPDBcdDGrnE
A recording of the Beethoven piece from which the play takes its title.
Great Works: The Isle of the Dead (1880), Arnold Böcklin
An article about the painting that appears at the end of the play.