Multi-belled Brass
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All About Brass - Performing Arts
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Early Valve Designs
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How to Oil the Valves on a Trumpet, Baritone, or Tuba - Hillje Music Centers
Handy hints and tips for rotary valve maintenance – Wessex Tubas
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Rotary Valves or Piston Valves? - JP Musical Instruments
How valves are used to change the note played – North Tyneside Brass in Schools
