CHICO Instrument Encyclopedia
Information categorized geographically and by type. Features histories and photos.
http://www.si.umich.edu/chico/instrument/

The Institute Of Musical Instrument Technology
The main professional body covering the music industry. Features publication and membership details.
http://www.imit.org.uk/

Pro-Music-News
News from the music industry and professional recording and P.A. technology and well as keyboards and percussion product news. [English/Deutsch]
http://www.pro-music-news.com/

Society for Self-playing Musical Instruments
Devoted to the devices and their use, design, history, and sale with links to museums and related organizations [English/Deutsch].
http://www.geocities.com/Vienna/2831/

Mechanical Music Digest
Moderated forum about musical instruments that play themselves. Published daily on the Internet and distributed primarily by e-mail.
http://mmd.foxtail.com/

Musiciansnews.com
News for musicians about instruments, artists and competitions.
http://www.musiciansnews.com/

NIU Musical Instrument Collection
Photographs and audio samples of instruments from around the world, organized alphabetically, geographically, and by type.
http://www.engineering.usu.edu/ece/faculty/wheeler/NIU/

World Musical Instrument Gallery
Descriptions, photographs, and some sound samples of instruments in Randy Raine-Reusch's large collection.
http://www.asza.com/ihm.shtml

MFA: Musical Instruments
Photographs and information about instruments in the extensive collection at the Museum of Fine Arts, Boston.
http://www.mfa.org/artemis/collections/mi.htm

Iberian Folk Instruments
Photographs, descriptions, and audio samples of traditional instruments and music-related images from the Iberian Peninsula.
http://www.tamborileros.com/tradiberia/e_inicio.htm

Australian Aboriginal Musical Instruments
Descriptions and images of the didjeridu, bullroarer, gum-leaf, and clapsticks.
http://www.didjshop.com/austrAboriginalMusicInstruments.htm

Lithuanian Instrumental Music
Photographs and descriptions of traditional instruments, article on ensembles, glossary, and bibliography.
http://ausis.gf.vu.lt/eka/instrum/instru_c.html

The Classical Free-Reed, Inc.
Offers information about free reed instruments including the accordion, bayan, concertina, harmonica, sheng and reed organ. Includes definitions, descriptions, history, articles, reviews and a performers directory.
http://www.ksanti.net/free-reed/

Taxonomy of Musical Instruments, by Henry Doktorsi
Chart based on a 1914 scheme by Sachs and von Hornbostel classifies orchestral, folk, and electronic instruments into families. A second chart maps the free-reed family, which includes harmonicas and concertinas, supported by a scholarly history of free-reeds.
http://www.ksanti.net/free-reed/description/taxonomy.html

Musical Automata
Systematic recording project begun in 1980 documenting mechanical music devices from Vienna and Prague, with CDs available for sale beginning in 1999. Headed by Helmut Kowar of Phonogrammarchiv, the audiovisual research archive of the Austrian Academy of Sciences.
http://www.pha.oeaw.ac.at/Mechanical_Music/

Duke University Musical Instruments Collections
Collection built around a 2000 bequest of 400 instruments and 100 paintings from a Duke alumnus. Details of exhibits and performances.
http://music.duke.edu/dumic.php

Experimental Musical Instruments
Online archives of quarterly journal devoted to interesting and unusual musical instruments and sound sources, along with sales of instruments and guides on how to make and play them.
http://www.windworld.com/

Frequencies and Ranges
A table of extremely low musical notes matching frequencies with instruments able to play them. Links to pictures and articles including a subcontrabass clarinet built especially to play C-2, or 4 cycles per second.
http://www.contrabass.com/pages/frequency.html#Db1

Face Music: Traditional Instruments of the Mongolia People
Brief descriptions and photographs.
http://www.face-music.ch/instrum/mongolia_instrum.html

Musical Instruments - The Metropolitan Museum of Art
The Met presents an international array of musical instruments of historical, technical, and social importance, as well as tonal and visual beauty, from accordions to zithers.
http://www.metmuseum.org/Works_Of_Art/department.asp?dep=18

Musical Instrument Reference
Resource for teachers and students. Modern musical instruments, transposition, concert pitch and best sounding range.
http://musicarrangers.com/instruments/