Open Tunings - a source of inspiration and a way of widening creative options for many guitarists. Open D to Fourth Tuning – this book presents over 20 of the most commonly used open tunings. Tuning charts, chords and scales for each tuning enable it all to be put into practice straight away. The supplementary appendix also contains a transposing table, a list of chord symbols, the basic chords in standard tuning and a list of chord/scale relationships.