In most modern wind instruments the pitch is changed by using keys or valves to change the length of the vibrating air column. The bugle, however, has no valves or keys, yet it can play many notes. How might this be possible? Are there restrictions on what notes a bugle can play?

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In most modern wind instruments the pitch is changed by using
keys or valves to change the length of the vibrating air column. The bugle,
however, has no valves or keys, yet it can play many notes. How might
this be possible? Are there restrictions on what notes a bugle can play?

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