The origins of the Tuba:Twists and Turns in the Development of the Tuba - Musical Instrument Guide - Yamaha Corporation
Tuba and Euphonium
Baritone horn - Wikipedia
Choosing an Instrument: Tuba, Baritone Horn & Euphonium with Tony Neal | musical instrument | Lecturer Tony Neal introduces us to the Tuba family in the brass section. This includes the Baritone