When I was about 14 I had Pete Seeger's Folksinger's Guitar Guide. It seemed pleasantly relaxed in it's approach - compared to the 'standard' book, Play in a Day by Bert Weedon. I seem to remember one of the early accomplishments that Pete encouraged on the record was to develop an 'educated' thumb on the right hand! There was a great tune at the end of the book called Mexican Blues. I finally managed to struggle through it but could never make it sound the way Pete Seeger did. I wonder if, 45 years later, I could make a better job of it??