The "Tuba Family" refers to a group of brass instruments that produce sound through the vibration of lips against a mouthpiece. This family includes instruments like the tuba, euphonium, and baritone horn. They are known for their deep, rich tones and are commonly used in orchestras, concert bands, and brass ensembles. In the Tuba Family, the tuba is the largest and lowest-pitched instrument, while the euphonium and baritone horn have a slightly higher pitch. These instruments are typically made of brass and can be played in various musical styles, from classical to jazz.