http://www.blackdiamondbrass.com/tbahist/tubahist.htm
http://en.wikipedia.org/wiki/Ophicleide
http://en.wikipedia.org/wiki/Ophicleide
http://en.wikipedia.org/wiki/Helicon_(instrument)
http://en.wikipedia.org/wiki/Tuba
http://en.wikipedia.org/wiki/Saxhorn
http://en.wikipedia.org/wiki/Wagner_tuba
http://en.wikipedia.org/wiki/Sousaphone
http://www.youtube.com/watch?v=W535OQhEjM8
https://www.youtube.com/watch?v=ab2HzFtdOPc
http://www.dwerden.com/comp/aCompIntro9_FlowFlow_F4.html
http://en.wikipedia.org/wiki/Ophicleide
http://en.wikipedia.org/wiki/Ophicleide
http://en.wikipedia.org/wiki/Helicon_(instrument)
http://en.wikipedia.org/wiki/Tuba
http://en.wikipedia.org/wiki/Saxhorn
http://en.wikipedia.org/wiki/Wagner_tuba
http://en.wikipedia.org/wiki/Sousaphone
http://www.youtube.com/watch?v=W535OQhEjM8
https://www.youtube.com/watch?v=ab2HzFtdOPc
http://www.dwerden.com/comp/aCompIntro9_FlowFlow_F4.html