2016 Les Paul A guitar pickup is actually much like a powerful mike coil. For decades, dynamic microphones have been sent with the style coil attached with the primary of the microphone's transformer, and perhaps not introduced to ground (‘floating'). The microphone's case is typically attached to the cable guard, which will be connected to the mike amplifier's floor (see Rane's website for more discussion).
By and big, dynamic microphones are extremely calm units consequently of the mix of transformer isolation and healthy, flying transmission lines throughout, as well as shielded, humbucking coils.
Therefore why don't you guitars? Instruments are once affected by noise. Humbucking pickups are only an incomplete (though crucial!) solution. The most obvious alternative would be to float the guitar pickup to a healthy output, being a microphone. An identical strategy was printed that 2001 patent request such as 2016 Les Paul?