A euphonium is a brass instrument. It is most likely to be found in a brass band.
Ear drums are another kind of drum, which is not a musical instrument. Without our ear drums, we wouldn’t hear music in the usual way. However, Evelyn Glennie is a wonderful deaf musician, who is a spokesperson and pioneer bringing music to people who would otherwise have been considered incapable of enjoying it, let alone performing it. Please click on the link to see and hear her.
Electric guitars are popular with pop-musicians. They require amplifiers and all sorts of electronic wizardry.