For the top learning we indicate a Stefan Grossman exercise for Ragtime guitar.
Wonderful page and wonderful mp3 to know better this way to approach to the guitar.
Don't forget it.
Here the page
About Stefan Grossman
(born April 16, 1945) is an American guitarist.
Born in Brooklyn, New York, he was a member of Even Dozen Jug Band in the 1960s. He was a student of Reverend Gary Davis and is well known as an author and publisher of guitar tuition books and videos. Grossman co-founded Kicking Mule Records in 1972. Scores of professional fingerstyle acoustic guitarists got their start on this label.