Big T Music Ltd is a Bristol, UK-based Eurorack modular synthesizer specialist founded by a builder known as Gaz. The company focuses on producing high-quality reissues and reworkings of classic Mutable Instruments modules, which became highly sought-after after Mutable Instruments ceased production. Big T Music's modules are handmade locally in Bristol and are known for their distinctive black and gold panel aesthetics, though silver panel options are also available.

The company's lineup includes the Rangoon (a 12HP reissue of Mutable Instruments Rings), Monsoon (a 12HP version of Clouds with sliders and bipolar CV LEDs), Beehive (an 8HP reworking of Plaits), Ornament and Crime (a uO_C multi-function module), Shifty (a 6HP voltage doubler and shifter utility), and reissues of Stages and Veils. Many of these modules feature more compact form factors than the originals. Big T Music also produces the Gap Banisher series of blank panels in various widths.

Beyond module manufacturing, Big T Music offers synth repair services, sound design, and equipment brokerage. Their modules are sold through retailers like Elevator Sound in Bristol and directly via Reverb, where the company holds Preferred Seller status.