.
But
we have and it's changing according to Tusenfem.....
Earth has the same thing going on
Why do you keep denying it Jonesdave116?
Told you, don't link to youtube stuff. It isn't science, and I'm not wasting bandwidth. And, as Tusenfem explained, (and he's more qualified than you, me, or any of the EU delusionists) the 'singing' is nothing to do with electric woo on the surface of a comet.
Electric woo would leave remnant magnetism on the surface, even if it happened a long time ago. The comet is non-magnetised. Electric discharges create brief but powerful magnetic fields. Electric currents create magnetic fields. We see zilch. Not only zilch, but the outburst on 29 July was followed by a huge drop in the magnetic field strength!
The diamagnetic cavity, at 67P and Halley, shows that there is no solar wind reaching the cometary surface once it forms. There is nothing electrical of note going on in the cavity. By definition, it would no longer be diamagnetic.
In case you've forgotten, let me refresh your memory of what the EC idea requires; it requires electric woo on the surface. Not observed, not detected. It is supposed to liberate O- from the surface. No, it's O+ that we see in the coma. It then requires the solar wind to increase by umpteen orders of magnitude to create the H2O that has been observed. Unobserved. Not only unobserved, but non-existent within the diamagnetic cavity. As has been known (except to the EC nutters) for 29 years.
So, you've still got H2O and CO2 and various other gases coming off the comet, but no interaction with the solar wind to explain them. So you're left with no option but to invoke some method of directly creating the observed gases from the surface. You don't have one.
Therefore, with no electric woo on the surface and no solar wind, you are still where you were. With zero evidence for a nutty idea that nobody of any scientific note takes seriously.
Maybe Thornhill et al need to rename their hypothesis. How about; the invisibly, undetectably electric comet?