I assume it's a form of tonal architecture: a form of magic that works a bit differently from traditional magicka based magic. My understanding is that you're using sonic energy to change the "music" (basic fabric) of reality.

The Dwemer used tonal architecture in addition to traditional enchantments. I've never heard this explicitly stated, but I always assumed The Voice was tonal architecture as well.

Many races have sound based magic, like the dwarves tonal architecture or the bosmer spinners. From what I remember offhand, sword singers could conjure blades with their own brand of sound magic, impossibly sharp and able to be wielded even if the singer's arms were removed. From the UESP page that your question got me to look back up.

"The greatest among the sword-singers were known as "Saints of the Sword", or Ansei in Yoku. Ansei had the ability to manifest a sword from their very soul, known as a Shehai or "Spirit Sword". By sheer force of will, an Ansei warrior could create this ethereal sword of pure thought and it would take shape in their hand."

"--disarming such an Ansei could only be done by severing their head or taking their mind."

https://en.uesp.net/wiki/Lore:Sword-singers

So basically, like nords can shout flame by imbuing their soul into their voice, redguard sword singers could form magic swords. That uesp page has a lot of the information and references to where their information was gathered if you wanted to read heavily into it.

Grandchamp1989 wrote: »

Any lore buffs out there who can lead me to what exactly this sword singing is?

I sounds really cool and I want to learn more.

As others have explained, it's some form of magic that grants the user some control over reality through sound, which they use to manifest incredibly potent and dangerous blades

How potent and dangerous? In "Lord Vivec's Sword-Meeting With Cyrus the Restless" by Kirkbride, Cyrus states the following:

"When we fight, our swords can kill the laws of nature itself. Yokuda is as you see it because our hira-dirg swords can cut the atomos, the uncuttable, and we did."

Kirkbride's stuff isn't canon for the most part, however in this case it is referenced ingame by The Warrior in Hel Ra Citadel when he states that "The Shehai of a first rank Ansei sank Yokuda"

Which pretty much means a Shehai might be able to cause a thermonuclear blast by cutting atomos or something cataclysmic enough to sink a continent

Beffagorn wrote: »

Grandchamp1989 wrote: »

Any lore buffs out there who can lead me to what exactly this sword singing is?

I sounds really cool and I want to learn more.

As others have explained, it's some form of magic that grants the user some control over reality through sound, which they use to manifest incredibly potent and dangerous blades

How potent and dangerous? In "Lord Vivec's Sword-Meeting With Cyrus the Restless" by Kirkbride, Cyrus states the following:

"When we fight, our swords can kill the laws of nature itself. Yokuda is as you see it because our hira-dirg swords can cut the atomos, the uncuttable, and we did."

Kirkbride's stuff isn't canon for the most part, however in this case it is referenced ingame by The Warrior in Hel Ra Citadel when he states that "The Shehai of a first rank Ansei sank Yokuda"

Which pretty much means a Shehai might be able to cause a thermonuclear blast by cutting atomos or something cataclysmic enough to sink a continent

THIS.

THIS is peak Elder Scrolls right here. I wish ESO had more cool lore like this.