Thumb behind the neck is the standard classical guitar position. It works well on nylon string guitars with their wider necks, but not so well on narrow necked acoustics or electrics. It's good for classical technique but not so good for non-classical techniques such as string bending. If you check some videos of the world's greatest non classical guitarists, such as, Chet Atkins, Doc Watson, Merle Travis, Joe Pass (a little) and Django Reinhardt you'll often see their thumb sitting proudly above the neck.
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