7 STRING - DROP C# / Db (452hz alteration) - GUITAR TONES TUNING - YouTube
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How to Tune a 7 String Guitar (Songs, Alternate Tunings, Diagrams) - Guitar Gear Finder
L476 7-string - Rodgers Tuning Machines
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Top 40 Famous&Easy Seven String Guitar Songs In Standard Tuning/Drop A – Tabs Included – Rock Guitar Universe
List of guitar tunings - Wikipedia
Repetitive tuning - Wikipedia
A Guide to Open String Tunings | Making Music Magazine
