Open tunings

[FNG]

It's shocking how many rock songs were obviously written in DADGAD around that time.

Like which ones?

 

[Guildedagain]

It runs way deep, the DADGAD influence on the early English Rock scene. If the songs weren't written in DADGAD, some were highly influenced by it.

Davey Graham - Wikipedia

en.wikipedia.org

Paul Simon emulating Graham on what looks like a Guild F30.