How to Tune a 7 String Guitar (Songs, Alternate Tunings, Diagrams) - Guitar Gear Finder
7-string, 8-string, 9-string & 10-string Guitars
I got fed up with my 9 string because it couldn't get the sound I wanted. Now I can tune down to drop Gbbbbbbb and it's the best toan : r/guitarcirclejerk
List of guitar tunings - Wikipedia
The Ultimate Guide To 7 String Guitar Tuning - Killer Guitar Rigs
Furch Blue Deluxe Gc-SW 9 String with Stage Pro Element Sitka Spruce / - Heartbreaker Guitars