Google Search: Early Sheet Music
Google Directory: Classical Sheet Music
Google Scholar: Early Music Sheet Music
Google Blogs: Early Music Sheet Music
Google Books: Early Music Sheet Music
Comprehensive selection of Early Music scores (mostly in the PostScript .eps format).
Early Music facsimiles from Bodleian Library of the University of Oxford.
The Cantigas de Santa Maria medieval-era manuscripts are one of the largest collections of monophonic songs from the middle ages.
Begun in December 1998, CPDL is one of the world's largest free sheet music sites. You can use CPDL to find scores, texts, translations, and information about composers, including composers of Early Music.
Recommended books and scores from Classical.net.
The Early Music FAQ Scores, Sounds & Sources page, with links to Facsimiles, Editions & Texts.
Wide-ranging selection of free early music scores by genre, composer, and instrument.
IMDBP strives to categorize every single piece of music ever written.
Italian madrigals, particularly from the late-16th/early-17th centuries.
Lute tablatures (PDFs and PostScript) from Wayne Cripps.
Lute tablatures from Richard Civiol.
Classical guitar and lute tablature from Allan Alexander.
Recorder music (PDFs and sound files) provided by Christian and Annette Mondrup.
Free early music sheet music (PDFs) from Hansmons.com.
2000+ pages of online Sacred Renaissance Polyphony.
Free sheet music downloads for almost any instrument.
A multi-lingual search engine for musicians, helping them to search throughout hundreds of sites for scores, sheet music, tabs, backing tracks, lyrics, mp3s, and other necessary information.
Sheet music (PDFs) from the 17th & 18th centuries.
The WIMA is one of the Web's most comprehensive sources for Early and Classical Music scores (PDFs). See also their Other Free Sheet Music Archives page.
Free Early Music scores (PDFs) from Art Levine.
Wide selection of free Baroque sheet music.
Andrew Fredel's scores for recorder and other instruments here.
Ann McKinley's scores for recorder, voice, and other instruments here.
John Osterhagen's scores for recorder, voice, and other instruments here.