What animal horn is most used in instruments?

The animal horn most used in instruments is the horn of the ox, also known as cattle horn. Ox horns have been used for centuries to make a variety of musical instruments, including the French horn, tuba, trombone, euphonium, and alphorn. Ox horns are preferred for these instruments due to their natural shape and size, which allows for the efficient production of sound. Additionally, ox horns are relatively easy to work with and shape, making them a versatile material for instrument makers.