Marching brass
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Marching brass instruments are brass instruments specially designed to be played while moving. Most instruments do not have a marching version - only tubas, baritones, euphoniums, and French horns have marching versions; the tuba even has two. The main difference between the concert horns and their marching counterparts is that the bell has been relocated to project sound forward rather than over (or under) the player's shoulder. Because these instruments are used in an activity that is predominantly outdoors they tend to be sturdier and more resistant to wear and tear than their concert counterparts. These instruments are used by all kinds of groups ranging from high school marching bands to drum and bugle corps.