Bodleian Library Broadside Ballads – Materials range from the 16th century to the 20th century. The project makes the digitised copies of the sheets and ballads available to the research community. There are also some audio files

Choral Music – Free choral/vocal scores, texts and translations

ClassicalNet – Features more than 9000 pages and 20,000+ images including more than 7200 CD, SACD, DVD, Blu-ray, Book and Concert reviews and over 5500 links to other classical music web sites

Europena – “Explore 54,217,972 artworks, artefacts, books, videos and sounds from across Europe. ”

DIAMM (Digital Image Archive of Medieval Music) – A leading resource for the study of medieval music manuscripts. Look under ‘Resources’

Duke University Library Sheet Music Project – Sheet music from 1853-1920.

Electronic Dictionary of Musical Themes – Collection of 9,825 musical themes (the works of over 150 composers) from the Barlow-Morgenstern original compilation can be played in any browser using Quicktime. You can search by composer, by category of music or by note (solfeggio) in key-independent fashion

Folk Song Index – An index to traditional folk songs of the world with an emphasis on English-language songs. Each entry includes the song title, first line of chorus, first line of verse, and full bibliographic information on the source. The index contains over 62,000 entries, and, to date indexes over 2,400 anthologies

Internet Archive Audio – Over 200,000 free digital recordings

J.S. Bach – Resources on the life and music on J.S. Bach

Library of Congress National Jukebox – Historical sound recordings available to the public free of charge

Music Theory Online – Published several times each year, each volume of MTO includes features such as articles, reviews, commentaries, and analytical essays. It also provides a dissertation index

Online Resources for Music Scholars – Provides useful weblinks

Sheet Music Consortium – Access to online sheet music

World War I Sheet Music – From Brown University