• Billboard.com
• International Computer Music Association
• Scholarly Societies-Music

Composers

• Classical Net
• Hector Berlioz Website

Computer Music

• Center for New Music & Audio Technologies (UC Berkeley)
• Computer Music Links
• Electronic Music Foundation

Dictionaries, Organizations, Directories and Indexes

• AllMusic.com
• Internet Archive (Live Music and Audio Archives)
• MusicalOnline (Classical)
• Online Resources for Music Scholars (Loeb Music Library)
• Performing Arts Encyclopedia (Library of Congress)

Genres

• A Jazz Improvisation Primer
• Baroque Music Homepage
• Film Score Monthly (Motion picture and television music)
• Hispanic World of Musicians and Actors
• Jazz Biographies
• Robert & Molly Freedman Collection of Jewish Music
• Roger McGuinn's Folk Den (folk music archive with lyrics)

Instruments

• Instrument Encyclopedia
• Medieval and Renaissance Instruments
• National Music Museum (University of South Dakota)

Museums

• American Jazz Museum
• Museum of Making Music
• Rock and Roll Hall of Fame

Musicology and Music Theory

• Music History links (University of Washington)
• Society for Music Theory
• Teoria-Music Theory Web

Sheet Music

• African American Sheet Music (Library of Congress)
• Historic American Sheet Music (19th and 20th century/Duke University)
• Keffer Collection of Sheet Music (1790-1895 American Popular Music/University of Pennsylvania)
• Lester S. Levy Collection of Sheet Music (1780-1960 American Popular Music)
• Music for the Nation (Library of Congress)
• Ozark Folk Songs (scores and audio files)
• Performing Arts in America, 1875-1923 (New York Public Library)

Vocal Music/Opera

• America Singing (song sheets from Library of Congress)
• Marian Anderson Collection of Photographs (University of Pennsylvania)
• Mudcat Cafe and Digital Tradition Folksong Database (lyrics search)
• Operabase
• OperaGlass (Stanford)

World Music

• East African Music Archive (Vanderbilt)
• Ethnomusicology, Folk Music, and World Music (University of Washington)
• World Music Central
• World Music Network