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Large bore valve trombone/"do everything horn" project - TromboneChat
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Adolphe (Antoine Joseph) Sax | Tenor valve trombone | French | The Metropolitan Museum of Art
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Superbone - Wikipedia
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How do trombone players play the exact note they want? The slide looks so imprecise compared to keys. - Quora
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High grade Piston valve trombone Cupronickel Slide sleeve Brass Bell - AliExpress
