This is free sheet music printable in PDF format, along with some accompanying midi files. African American Sheet Music A collection of sheet music from 1850-1920. The Virtual Tunebook Musician Dan Beimborn provides us with 87 Celtic tunes in GIF format, some with midi audio clips. Beimborn has transcribed traditional folk tunes for the site as well as some of his own compositions. Virtual Sheet Music You can find lots of printable PDF sheet music for various instruments here.
All pieces are classical and organized by composer, instrument, ensemble, category and skill level.
Here is a site rich with resources for guitarists of any level. Free instruction is included here, including 512 lessons published for any skill level and any style, with instructional sound files. You can find midi audio files here as well as downloadable and printable PDF sheet music. If you download the free Scorch program, you'll be able to take advantage of an exciting feature which allows you to watch a cursor follow the sheet music as it's being played. You can choose from music for beginning, intermediate or advanced students.