 Some of the double-bell euphoniums had five valves, with the fifth valve either on top with the other four, or by itself off to the side, but the double-bell fifth valve was used for switching the sound to the second smaller trombone-sized bell, and not for changing the fingering pitch of the instrument.Also, Musical Instruments manufactures several euphoniums with five vertical rotary valves today, but this is an unrelated recent development.Euphonium has historically been exclusively a "band" instrument (rather than an "orchestra" or "jazz" instrument), whether of the "wind" or "brass" variety, where it is frequently featured as a solo instrument.