Watch the Triste online guitar lesson by Mimi Fox from Jazz Performance
This is a piece by the great Antonio Carlos Jobim one of the great Brazilian composers. I recommend you listen to as much of this music as possible to get into the complexity of the rhythm and the harmony. Brazilian music has a very different feeling than jazz here in the States. You can read all sorts of books about it, or you can expand your ears by going to the source and checking out the music directly. You will be amazed at how rich this music is!