What type of instrument is a euphonium?

Answer 1

It was originally intended as an instrument for German marching bands, but spread to British brass band music, where it remains a staple in any ensemble. It is still used frequently in marching and military ensembles internationally.

Answer 2

Euphoniums are made of brass, and either silver plated, or lacquered. Euphoniums are a part of the brass family of instruments. There are some very different exceptions, but generally, all are made of brass.
Euphoniums are usually made out of brass. That's why it's refered to as a brass wind instrument.

Answer 3

Usually out of brass. That's why it's refered to as a brass wind instrument.

Answer 4

The euphonium is a conical-bore, tenor-voiced brass instrument and is a member of the low brass family. See related link for more information on the euphonium.