You say it sounded like an electric guitar, but you didn’t answer the really pressing question. Was it closer sound to Jimmy Page or Eric Clapton??? Inquiring minds want to know. 
In all seriousness though. Although I applaud the clear video image, I wish more folks would supply such a clear example, it doesn’t really tell a complete story.
Here is what I would recommend and then repost a recording. If you perform a first-layer test, it will eliminate the vibrational changes that occur as a result of the head movement following the individual model.
Here’s what I would recommend. First start with a cube primitive and scale it to 200x200x0.2mm. This will lay down a single layer.
Then I would run two different versions of that test to see if you are getting vibrational noise from one motor or the other.
Here’s how that setting looks in the slicer. Note that the top layer is 0, bottom 1 and 100% infill using aligned rectilinear. What this will do is lay down a single 45 degree(the default) set of lines. Why 45 degrees. Because the stepper motors actually operate 45 degrees off-plane. If you want to prove this for yourself, simply power off the printer and move the printhead in 45 degree angles. What you will see is only one of the belts move at a time. However, if you move it at 90 degrees, both will move.
Then repeat this but change the infill direction to 135 which will produce a pattern 45 degrees in the other direction thus isolating the other stepper motor.
By doing this, you will be able to “listen” to see if there is one motor or another that is causing unusual noise.
But bear in mind, the noise you cited can also be explained by nozzle drag induced by poor leveling, the model lifting off the plate, or some other reason that could cause the nozzle to drag across the model. It’s hard to tell from your video, which is why a first layer test will help mitigate those variations and rule that out.
I’ve had this very thing happen when I switched to, let’s say, a CF filament, which is quite abrasive, and also failed to level the bed while changing plates. What happened in my example was a perfect storm. I had the bed not properly leveled, I changed to a thicker plate, I neglected to use a brim, the corners lifted up, and finally, the abrasiveness of the filament itself caused a horrendous noise as the nozzle dragged across the surface of the model. I stopped it about 2 inches into the model because of the noise, then leveled the bed and added brims, and all the noise disappeared.
