Which instrument is described as belonging to the brass family, consisting of four meters of tubing curled around?

The French Horn is a member of the brass family known for its distinct sound and complex tubing structure. It is characterized by approximately four meters of coiled tubing that contribute to its rich and mellow tone. The unique shape helps produce a variety of pitches by altering the air flow through the instrument using mouthpiece pressure and finger positioning on the valves.

The trumpet, while also a brass instrument, has a much more straightforward design with less tubing and typically a brighter sound. The trombone, distinguished by its slide mechanism, does not feature the extensive coiling seen in the French Horn. The baritone, though sharing similarities with other brass instruments, has a different design and structure, focusing more on producing a deep, warm sound without the specific curled tubing configuration of the French Horn. Thus, the accurate identification of the instrument that fits the description is indeed the French Horn.