Free Online Fake Book
thefakebook.com is a free online fake book. Lead sheets with chords, lyrics, and melody are provided for public domain music in various styles, including hymns, traditional Celtic music, Christmas songs and hymns, and more. C, Bb, Eb, and bass clef versions are provided for each tune along with tablature versions for banjo, bass guitar, guitar, and mandolin. These are provided as as PDF downloads.
The site will be updated periodically with new music. This will be a slow process due to the many versions required for each piece, but the eventual goal is to provide hundreds, possibly even thousands of musical works in lead sheet format.