Electric Light 4-String Cigar Box Guitar Strings - Open G/Open D/Standard Tunings - DBGD/DF#AD/DGBE - C. B. Gitty Crafter Supply
Tenor Guitar Tunings - Papa Dafoe
Tuning a bass guitar using 5th Fret Method - Get-Tuned.com
Tenor guitar - Wikipedia
Bass Guitar Tuning Guide – How to Tune Bass Guitars | Sweetwater
Book One - 4 String: Cigar Box Guitar Jazz & Blues Unlimited - Book One 4 String: Book One: Riffs, Scales and Improvisation - 4 String Tuning GDGB (Paperback) - Walmart.com