The OED word of the day is carnyx

"carnyx, n. A type of bronze horn or trumpet associated with the Celtic peoples of the Iron Age, typically consisting of a mouthpiece at the base of a long vertical tube widening at the end into a bell (often in the form of an animal’s head)"

https://www.oed.com/view/Entry/95173253?utm_campaign=oupac-campaign%3A1491358056338888981&utm_source=Twitter&utm_medium=social&utm_content=post%3A1577687426696975058&utm_term=The%20OED

it sounds like this

https://www.youtube.com/watch?v=jRIQp4qZrrE