What guitar strings did the Beatles use? Investigating the flatwound vs roundwound debate | Guitar World
The Beatles Secret Weapon: A Nylon String Classical Acoustic - Victor Records Editorials — Victor Talking Machine Co. | Entertainment
Is this the world's most expensive guitar string? An Epiphone string Paul McCartney used to record the Beatles' Rubber Soul is expected to fetch over $5,000 at auction | Guitar World
What kind of guitar strings did the Beatles use? - Quora
Lot Detail - The Beatles 1964 Guitar String Packaging Uncut Sheet