Tonal Architecture is the manipulation of sound to alter reality. The most notable of these users of Tonal Architecture were the Dwemer who had had Tonal Architects who would work with tonal architecture. They would wear protective headgear known as Dwemeri Tonal Attenuators which would protect ears and thought-organs from the harmonic feedback fluctuations of their work. The Dwemer exhibited near total mastery of tonal forces and would use it in mining, medicine, architecture—even psychology. Ancient Chimeri scholarship states that the Dwemer could employ tonal forces to bend weaker minds to their will—a form of complex aural hypnosis. The Dwemer were able to create devices in a limited scale using massive devices called Tonal Resonators. They are said to be complex architectural wonders that stood taller than the most imposing giants, and filled cavernous chambers with pipes, dials, and pistons. When enabled, the resonators released a series of powerful tones that could alter the brainwaves of lesser mer and men—inducing deep calm and profound pleasure, or even paranoia and terror and they were said to have virtually limitless uses. 
In the First Era, following the discovery of the Heart of Lorkhan by the Dwemer, Lord Kagrenac and his tonal architects created Kagrenac's Tools to manipulate the Heart via tonal architecture and use it to create their own god, the Numidium. Instead, this act ultimately led to the disappearance of the Dwemer in 1E 700, and the tools were subsequently used by the Tribunal and Dagoth Ur to achieve divinity.
A Dwarven Resonator was discovered in the Kwama mines of Gnisis, when miners uncovered a Dwemer ruin within. It caused madness to the kwama inside, making the kwama hostile and making them turn on their own queen and on the miners. The miners inside also became mad, becoming fixated upon the song, humming it over and over and becoming fixated on making the melody right. People afflicted by it described the experience as being able to see the melody, its shimmer, putting a tone and a color to describe it. The resonator itself was disabled by the Soulless One and the miners were able to return to normal. Theories existed of it being a mind control device. 
Sotha Sil drew inspiration from the Dwemer for his creations, and their influence in his work is rumored to be traceable as far back as before their disappearance. Among these influences was his research on Dwemer tonal architecture, which he uses to perform his divine workings. He refined it further and created items based on their research, such as improving Dwemer tonal forks that could function as a divining rod, and the Resonant Sphere, one of Sotha Sil's minor marvels. The sphere produces an aural response upon applying magic to it, and chimes with a sound similar to the ones that ring in the Brass Fortress.
- Dwemeri Tonal Attenuator hat description in ESO
- A Guide to Dwemer Mega-Structures — Vorinara Kleeve, Dwemer Scholar
- Yagrum Bagarn's dialogue in Morrowind
- Baladas Demnevanni's dialogue in Morrowind
- Progress of Truth — Dissident Priests
- Kagrenac's Tools — Gilvas Barelo
- A Melodic Mistake quest in ESO: Morrowind
- 36 Lessons of Vivec, Sermon 36 — Vivec
- Dwarven Tonal Forks memento description in ESO
- Divaricated Tone Fork item in ESO
- Raynor Vanos's dialogue in ESO: Clockwork City