IMSLP (International Music Score Library Project): This website provides free access to a vast collection of public domain sheet music, including classical and contemporary compositions for various instruments and ensembles.
MuseScore: MuseScore is a free, open-source music notation software that includes a large community-generated library of sheet music. It also allows users to create and upload their own sheet music and collaborate with others.
Free Music Public Domain: This website offers an extensive selection of free sheet music in the public domain, including scores for piano, guitar, and other instruments, as well as vocal music.
ChoralWiki: A resource specifically dedicated to choral music, it offers a range of free sheet music for choirs of all levels.
Werner Icking Music Archive: This website provides free access to a large collection of classical sheet music, including works by famous composers such as Beethoven, Mozart, and Chopin.
Violin Sheet Music: A site catering to violin players, offering free sheet music for violin solos, duets, and trios, ranging from classical to folk and fiddle tunes.
Guitar Pro Tabs: A resource for guitarists, providing free guitar tablature for popular songs, arranged by genre and artist.
Jazz Lead Sheets: A website dedicated to jazz music, featuring free lead sheets for improvisation practice and learning jazz standards.
Classical Music Archives: A comprehensive repository of classical sheet music, containing works by composers from the Renaissance to the present day.
Piano Street: A website offering a wide variety of free sheet music for piano, including classical, pop, folk, and children's songs.