First trim your finger nails as close as you possibly can.  Take a black cat bone and a guitar and go to a lonely fork in the roads at midnight.  Sit down there and play your best piece, thinking of and wishing for the devil all the while.  By and by you will hear music, dim at first but growing louder and louder as the musician approaches nearer.  Do not look around; just keep on playing your guitar.  The unseen musician will finally sit down by you and play in unison with you.  After a time you will feel something tugging at your instrument.  Do not try to hold it.  Let the devil take it and keep thumping along with your fingers as if you still had a guitar in your hands.  Then the devil will hand you his instrument to play and will accompany you on yours. After doing this for a time he will seize your fingers and trim the nails until they bleed, finally taking his guitar back and returning your own.  Keep on playing; do not look around.  His music will become fainter and fainter as he moves away.  When all is quiet you may go home.  You will be able to play any piece you desire on the guitar and you can do anything you want to do in this world, but you have sold you eternal soul to the devil and are his in the world to come.