Downloadable Sheet Music
IMSLP - Petrucci Music Library — Approximately 315,000 items, including scores or parts of 94,000 works. IMSLP stands for "International Music Score Library Project." The library is named for Ottaviano Petrucci, printer in 1501 of the first book of polyphonic music set in movable type.
Project Gutenberg Sheet Music Project — Digitized public-domain sheet music, emphasis on chamber music.
Web Library of Seventeenth-Century Music — A service of the Society for Seventeenth-Century Music, making available 17th-century music in modern editions for scholars, performers, and students.
Free Sheet Music Guide — A guide to classical and popular sheet music and guitar tab sources on the Web.
Public Domain Sherpa — A guide to finding and using free sheet music.
Free-scores.com — c.67,000 items. Free downloads of scores in many genres, links to vendors of scores and instruments, a music sheet music competition, links to other sites offering free sheet music downloads.
DMOZ — Links to various sources of downloadable music sheets in the Public Domain.
Musicnotes.com — c.300,000 downloadable items, only a few of which are free. Described as the world’s largest e-commerce sheet music retailer and publisher, providing licensed digital sheet music and guitar tablature to more than four million customers worldwide.
The Mutopia Project — c.1900 items. Free classical music scores based on editions in the public domain. Works by Bach, Beethoven, Chopin, Handel, Mozart, and others. Volunteers typeset the music and create the digital files.
Sheet Music Archive — c.22,000 classical music scores, some of which are free.
Sheet Music Online — Free Public Domain sheet music downloads.
Musopen — The site's stated goal is to be the largest online repository of free musical scores in the public domain. Musopen is a non-profit charitable organization.
Jazz Lead Sheets and Chord Changes
Free Jazz Chord Charts That You Can Transpose — c.1300 chord charts of jazz standards that can be transposed to any key.
Jean-Luc Barbier Quartet: Les standards du Jazz — Website of Jean-Luc Barbier, saxophonist and jazz flutist. Contains the archives of his quartet from 1975 to1986.
eJazzlines — A large selection of jazz arrangements, including combo charts, jazz studio orchestra arrangements, vocals and instrumentals. Difficulty levels of easy to professional, classics from the dixieland and swing eras to jazz arrangements of current hits. Updated daily.
The Fake Book Library — A collection of musical lead sheets intended to help a performer quickly learn new songs.
ChoralWiki : Choral Public Domain Library — CDPL was Founded in 1998, ported to ChoralWiki in 2005, and incorporated in 2010 as a tax-exempt charitable organization. Free choral/vocal scores, texts, translations, and other useful information.
19th- and 20th-century Popular Song
Sheet Music Consortium — Tools and services that promote access to and use of online sheet music collections by scholars, students, and the general public.
Chatfield Brass Band & Music Lending Library — The library is a member of the Southeast Minnesota Library System and lends music to bands and musicians from all over the world. Borrowers are charged a small handling fee to cover expenses. The library has collected and cataloged more than 30,000 pieces, many of which are no longer in print.The music collection not only includes band music (the largest portion), but also orchestra, dance band, sheet music, and numerous other categories.
BandMusic PDF Library — BandMusic PDF Library preserves and shares band music from the Golden Age of the American Town Band. If you are looking for public domain music to play with a school band, community band, or other group, you will find it here — marches, waltzes, rags, theater music, cornet solos, trombone features, and more.