C-Thru Music is a UK-based company founded by Andrew Llewellyn that produces MIDI controllers built around the Harmonic Table note layout, an isomorphic system devised by Peter Davies in 1983. Instead of the linear black-and-white keys of a piano, C-Thru's instruments use a grid of hexagonal buttons arranged so that intervals, chord shapes, and scale fingerings remain identical across every key — a design intended to simplify transposition, modulation, and exploration of microtonal or non-traditional tunings.

The company's two flagship products are the AXiS-64 and the smaller AXiS-49. The AXiS-64 is a velocity-sensitive MIDI controller with pitch bend, modulation, sustain pedal input, and programmable splits, layers, and per-grid pitch offsets, aimed at live and studio performance. The AXiS-49 is a compact USB-class-compliant device featuring 14 columns of 7 hexagonal keys, marketed as a portable harmonic-table interface for working with DAWs and softsynths. Both have a small but devoted following among players interested in alternate keyboard topologies, including users who remap them for Bohlen-Pierce and other microtonal scales.

C-Thru Music has 2 products cataloged on Equipboard, including MIDI Keyboard Controllers. Their gear is featured by 3 artists, with the strongest followings in Electronic, Pop, and Rock. Notable users include Calvin Harris, Sevish, and Surachai.