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The Structure of the Acoustic Guitar:The rule of strings and pitch - Musical Instrument Guide - Yamaha Corporation
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The Structure of the Acoustic Guitar:Six strings, each with a higher pitch - Musical Instrument Guide - Yamaha Corporation
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D'Addario Guitar Strings - Acoustic Guitar Strings - 80/20 Bronze - For 6 String Guitar - Deep, Bright, Projecting Tone - EJ10 - Extra Light, 10-47 : Amazon.co.uk: Musical Instruments & DJ
![The Structure of the Acoustic Guitar:The rule of strings and pitch - Musical Instrument Guide - Yamaha Corporation The Structure of the Acoustic Guitar:The rule of strings and pitch - Musical Instrument Guide - Yamaha Corporation](https://www.yamaha.com/en/musical_instrument_guide/common/images/acoustic_guitar/mechanism_p03_02.jpg)