Tubos abertos e fechados

Tubo Aberto:
 
Acordeão
 

[http://jarasct.blogspot.com/2010/07/metodos-para-acordeao.html]
 
Tuba

 
[http://www.music.vt.edu/musicdictionary/textt/Tuba.html]
 
Flauta





[http://www.colegioweb.com.br/fisica/tubos-sonoros-.html]
 
 
Tubo Fechado:
 
Acordeão

[http://jarasct.blogspot.com/2010/07/metodos-para-acordeao.html]
 
 
Tuba
 

 
[http://www.music.vt.edu/musicdictionary/textt/Tuba.html]
 
Apito
 

[http://vitorbrendohsamuel.blogspot.com/2010_04_01_archive.html]