The general idea of ERGObrass supports is based on a simple fact that all brass instruments are heavy to hold. We all know that relaxation is very important in brass playing.
However, holding the instrument in playing position inevitably produces a static tension in hands, arms, shoulders, upper body and throat. Most players can play with this tension, of course - but the tension is always there disturbing the performance.
A typical euphonium weigh about 4 to 5 kilos. Your both arms weigh about the same each and you keep both of them up with the horn at the same time! It is like
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