The larger part of the DOS Amigos Homepage is dedicated to sharing music.
The guitar method by Aaron Shearer, the well-known American guitar pedagogue, states that the major goal for the guitar student is sharing music, i.e. performing it for other people. This brings you outside (the protection of) study and the small circle of friends and relatives, but makes your effort in learning to play quite useful: your music may move, enjoy, astonish or even exasperate other people (of course I hope that the latter will not happen to you).
You can share the music you are playing in another way as well: providing the sheet music enables others to play the music and -if desired- share it at their turn. That is exactly the intention of the DOS Amigos Homepage, beit restricted to music in the Public Domain. This applies to folk and traditional music and classical music of composers who lived before 1938.
If I expect that there is some kind of copyright involved for a specific piece, you will be able to play it, but the sheet music is not there. As a service and a gesture to the composer/publisher I will mention the source and if known the publication number. This enables you to buy the music if you like it.
All the music on this site forms a bit of a history. I have been playing the guitar for well over thirtyfive years. The larger part of the solo material on this site I have played myself. Here you will find the classical pieces only, the popular material I have been playing is not included in this web site. The guitar duo music forms the history of 15 years of repertoire of the Guitar Duo DOS Amigos. The Ensemble music is played by the Guitar Circle, and some pieces come from attempts to form an ensemble with another instrument than the guitar.