Hotel California By The Eagles A best guitar pickup is basically much like a vibrant microphone coil. For decades, active microphones have already been wired with the voice coil attached with the primary of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's case is typically linked to the wire guard, which can be linked to the microphone amplifier's soil (see Rane's web site for more discussion).
By and large, dynamic microphones are very quiet devices consequently of the mix of transformer isolation and healthy, flying transmission lines during, in addition to guarded, humbucking coils.
Therefore why don't you guitars? Guitars are notoriously overwhelmed by noise. Humbucking pickups are just an incomplete (though essential!) solution. Well-known option is always to move your guitar collection to a balanced output, being a microphone. A similar thought was printed this 2001 patent request like this Hotel California By The Eagles?