This site has many free sheet music files.

Many others are available in source file formats (Finale, Sibelius, capella, Myriad, etc.) that can be exported to MusicXML files. An increasing number are available directly in MusicXML format. The library has over 43,000 choral and vocal public domain scores available. IMSLP provides files in PDF format, but an increasing number of these PDF files include MusicXML attachments. 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 210,000 works. Downloading copyrighted scores requires a Musescore PRO subscription for $49/year. Public domain scores can be downloaded free of charge. This site offers downloads of over 1.5 million score files in MuseScore, MusicXML, PDF, MIDI, and MP3 formats. Compositions are available in a mix of PDF, MusicXML, MIDI, and original source formats. Over 56,000 of the compositions are available in MusicXML format. Musicalion is a subscription-based online library offering over 65,000 compositions, including both public-domain and self-published works. Here is a selected listing of sites where you can download sheet music in MusicXML or compatible formats. 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.

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