An ever-increasing number of sites make downloadable sheet music available in either MusicXML format or original source file file formats that can be converted to MusicXML. Here is a selected listing of sites where you can download sheet music in MusicXML or compatible formats.
A subscription-based online library offering over 27,000 compositions, including both public-domain and self-published works. Over 11,000 of the compositions are available in MusicXML format. Compositions are available in a mix of PDF, MusicXML, MIDI, and original source formats. An annual subscription is €29.
This site offers free downloads of MuseScore files contributed by the MuseScore user community. Downloads are available in MuseScore, MusicXML, PDF, MIDI, and MP3 formats.
IMSLP Petrucci Music Library
IMSLP, the International Music Score Library Project, has one of the largest collection of online public domain scores in the Petrucci Music Library, with over 79,000 works. IMSLP provides files in PDF format, but an increasing number of these PDF files include MusicXML attachments.
Choral Public Domain Library
The library has over 18,000 choral and vocal public domain scores available. An increasing number are available directly in MusicXML format. Many others are available in source file formats (Finale, Sibelius, capella, Myriad, etc.) that can be exported to MusicXML files.
Werner Icking Music Archive
This site has many free sheet music files. While many are in PDF format only, an increasing number are in MusicXML format or MusicXML-compatible source formats like Finale and capella. The Archive has since merged with IMSLP, but this original site is still available online.
This site includes a large selection of hymn tunes available in MusicXML, PDF, and MIDI formats.
The Band Music of Amilcare Ponchielli
An online critical edition of the band music of this Italian composer best known for his operas. The editions have been created by Prof. Henry Howey at Sam Houston State University from autograph manuscripts found in the Biblioteca statale in Cremona, Italy. The music is available in MusicXML, PDF, and MP3 formats.
Visaudio Designs provides designs for marching bands and percussion ensembles, including both ready-made and custom shows. The shows include editable notation files in both MusicXML and Sibelius formats.
La mà de guido
A music publishing house that specializes in music by Spanish and Catalan composers. They sell music as MusicXML files, as well as PDF files and print publications.
Folkoteca Galega (in Galician)
Offers Galician music in MusicXML and PDF formats.
Open Music Score
This site provides public domain music scores in open and editable format for musicians. MusicXML is the primary format used on the site.
Project Gutenberg Sheet Music Project
Has over 30 public domain scores available for free download in MusicXML format, including the Beethoven string quartets.
Margaret Greentree’s site offers the Bach chorales as free MusicXML files.
New Hymns for Worship
Dave Marney’s site offer hymns composed by Marney and friends for free download as MusicXML files.
This site (in German) offers free scores in a variety of formats, including MusicXML format.
This site sells Christian worship music in a variety of score and audio formats, including full orchestral Finale files. Their SongMap technology allows you to make custom arrangements of both the score and audio files.
Oliver Seely’s (mostly) Clarinet Page
Offers over 150 clarinet and woodwind scores available in Finale format, including chamber music and concertos.