1. Finding Aid for the Morton Feldman Papers, 1950-1999, at the State University of New York at Buffalo Music Library: A comprehensive online guide to this collection of Feldman's papers. The Morton Feldman Papers comprise personal and business correspondence, writings by and about Feldman, clippings, programs, and photographs. The bulk of the material was received as a gift from Barbara Monk Feldman in 1992, with additional photographs donated by William M. Colleran. The online Finding Aid is the work of Brian K. Ross (initial processing, 1993) and John Bewley (reprocessing, 2000), both of the State University of New York at Buffalo Music Library. Highlights of the site include:
   Images: A digitized collection of images of Feldman from various collections in the Music Library, University at Buffalo.
   Lectures: Summaries and/or transcriptions of lectures given by Feldman in the Slee Lecture Recital Series, 1972-1975, at the University at Buffalo. Includes audio files of some of the talks in streamed Real Audio format.
   Manuscripts: A list of all manuscripts and typescripts held in the collection including scanned images of some original handwritten and typed manuscripts.
   80th Anniversary Exhibition: Summary of the exhibition held at the Music Library (June 1 to September 15, 2006) in celebration of the 80th anniversary of Feldman's birth, January 12, 1926.
2. Tom Moore's interview: Transcript of pianist Tom Moore's interview with Feldman.
3. Edition-Peters: Publisher of Feldman's works until 1969.
4. Universal Edition: Publisher of Feldman's works from 1969 onwards. Their website contains a wealth of information including a searchable performance database, short performance excerpts in mp3 format, score examples and a comprehensive Catalogue of Works in downloadable pdf format.
5. Feldman Page at Malaspina Great Books: Includes links to US and UK library indexes of Feldman-related material.
6. Orlando Jacinto Garcia: Homepage of the Cuban/American composer whose music has been influenced greatly by Feldman's aesthetics.
7. Articles on Feldman by Volker Straebel: Texts (in German and English) by Volker Straebel , including his liner notes for the CD, "Morton Feldman: First Recordings - 1950s" (Mode Records CD 66).
8. Gespräch über das Feldman-Quartet: A profile (in German) of the Vogler Quartet by Martin Hufner, including an interview in RealAudio format about their recent performance (Berlin, 16th March 1999) of Feldman's Second Quartet.
9. Quartet Endurance: A short interview, in streamed RealAudio format, in which Noah Adams (one of the hosts of npr ONLINE, the internet arm of the US National Public Radio network) speaks with Tom Chiu, a member of the Flux String Quartet, about getting ready to play Feldman's String Quartet No. 2. The interview was originally broadcast on October 8th 1999, the day before the Flux Quartet performed the work in the Great Hall of Cooper Union in New York City.
10. Program Note for "Triadic Memories": Notes written by Louis Goldstein to accompany his performances of Feldman's piano piece, "Triadic Memories".
11. Bunita Marcus: Website of the fellow composer, inspiration and intimate companion of Feldman throughout the last decade of his life. The site includes the text of her Memorial Eulogy: For Morton Feldman.
12. For Stefan Wolpe: Liner notes by Steven Johnson for the CD recording of this piece on the New World Records label (80550-2).
13. Morton Feldman at the Festival d'Automne, Paris, 1997: Reviews by Dan Warburton.
14. Morton Feldman article in New Grove: An article by Steven Johnson on Feldman's life and works in the New Grove Dictionary of Music & Musicians 2nd edition on the web. Note: This is a subscription site. If you are not affiliated to a library with a subscription, try the 24 hour Free Trial.
15. Neither / Words and Music / For Samuel Beckett: Page devoted to Feldman in the music section of Apmonia: A site for Samuel Beckett.
16. Feldman on "For Philip Guston": A short introduction given by Feldman before a performance of "For Philip Guston" at Kloveniersdoelen, Middelburg, The Netherlands, on 6th July 1985. Dutch translation followed by the original English. (From the archives of the Netherlands Radio and TV service, NPS.)
17. Neither: Information (in German) on the production of Feldman's opera "Neither" by the Zeitgenössische Oper Berlin on 28th June 2000. Includes photo of the production and Feldman, plus Samuel Beckett's text in English and German.
18. What is slow? - Timing strategies in the performance of Feldman's "Last Pieces": An essay by Dirk Moelants which analyzes performances of "Last Pieces" and connects the timing of the performers with aspects of perception theory. (The full text of the essay is in the "Publications" section of the website.)
19. For John Cage: Liner notes by Paul Zukofsky for the CD recording of this piece by Paul Zukofsky and Marianne Schroeder on the Musical Observations label (CP2 101).
20. Spring of Chosroes: Liner notes by Bunita Marcus for the CD recording of this piece by Paul Zukofsky and Ursula Oppens on the Musical Observations label (CP2 102).
21. Photos of Feldman: Many photos of Feldman and others in the Photo Gallery on Peter Gena's website.
22. In memoriam Morton Feldman: An appreciation (in German) by Ad van't Veer posted on the Centrum Nieuwe MUZIEK Zeeland website.
23. In conversation - Morton Feldman and Iannis Xenakis: An edited transcript of a conversation between Feldman and Xenakis which took place on Friday, July 4, 1986 in Middelburg, The Netherlands, during the 1986 Festival Nieuwe Muziek. The transcript is posted on the Centrum Nieuwe MUZIEK Zeeland website.
24. UB's Feldman - One of a Musical Kind: Transcript of an article, now posted on the State University of New York at Buffalo Music Library website, in which Yvar Mikhashoff reminisces about Feldman shortly after his death in 1987.
25. Slowly Watching Memory - An analysis of Morton Feldman's "Rothko Chapel": An essay by Dániel Péter Biró.
26. In Search of an Orchestration: Online feature about the graphical score of this piece by Feldman. Part of a comprehensive online feature about graphical scores in modern music at the Block Museum of Art, Northwestern University: Pictures of Music.
27. Feldman Interviews: Audio files of interviews from the music archives of radio KPFA-FM, Berkeley, USA, made available at the Internet Archive by the Other Minds organisation. The site includes:
    • John Cage and Morton Feldman In Conversation, 1967
    • Morton Feldman Interviewed by Charles Shere, July, 1967
    • Morton Feldman, Speaking of Music, with Charles Amirkhanian, at the Exploratorium in 1986
28. Feldman's Composition for violin (1984) - Extended Just Intonation in interpretative practice: An essay by Marc Sabat.
29. On Feldman's use of repetition: An essay by Mark Randall Osborn.
30. In Dispraise of Efficiency - Feldman: The text of a lecture given by Kyle Gann at Seattle Art Museum as part of their "Morton Feldman Marathon" on January 27, 2008.
31. The Art of Touch: Programme notes by Philip Thomas for the four concerts in which he played Feldman's solo piano music in October 2002.

Thanks to John Bewley, Tete Blanes, Richard Friedman, John Johnston, John "Sparky" Prokop, Werner Praefcke and Dr David Reid for additions to this list.