Classic Cat: Directory of mp3s on the internet that have been made available by the performing artists.
Classical Music Archives: Mussorgsky: Biography from the Concise Oxford Dictionary of Music. Over 60 complete files offered in MIDI, MP3, and Windows Media audio formats, including live recordings of featured artists.
Classical Net: Recording highlights.
Grave of Modest Mussorgsky: Portrait and photograph of tomb from Find a Grave.
Kunst der Fuge | Modest Mussorgsky: MIDI files (freely downloadable) of "Pictures at an Exhibition" and "Night on the Bare Mountain"; also WMA / MP3 files.
Modest Moussorgsky: Karadar Dictionary entry with life, related composers, MIDI audio samples, catalogue of works, list of operas with phonetically spelled libretto of Boris Godunov, and portraits and other illustrations.
Modest Mussorgsky: Biographical note with pictures. From Grove.
Modest Mussorgsky: Wikipedia article with summary of life and works and links to related subjects and people plus portrait.
Modest Mussorgsky (1839-1881): Message board and live chat about the life and works.
Modest Mussorgsky: Voicing the Spirit of Russia: Timeline, key works, recommended recordings, and composer quote, from Humanities Web.
Modest Petrovich Mussorgsky (1839-1881): Brief biographical sketch, caricature, summaries of operas, piano works, and vocal music, and Naxos discography.
Mussorgsky: Piano Works, Including Pictures at an Exhibition: A personal review of some recordings.
Pictures at an Exhibition by Modest Mussorgsky: Explanation of the interaction between the music and the Hartman paintings.