Expert Guitar Instructor Mark John Sternal is the author of over 25 best selling guitar and bass instructional titles. Mark began teaching his trademark method to private students in 1991. He was only 17, with one year left of high school before he would attend Richard Daley College in Chicago. By 1994, Mark had relocated to Florida and with him came the manuscript for his first book. Fueled by glowing user feedback and testimonials from thousands of satisfied customers, Mark's growing number of music instruction titles awarded him national recognition in 2004. Since then, his titles have consistently held the #1 best selling music instruction slots at some of the largest music and book stores in the United States.Sternal, Mark John is the author of 'Twelve Notes Of Music Ear Training And Interval Study Course' with ISBN 9780976291725 and ISBN 097629172X.