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Period: to
1590-2015
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Serpent
The euphonium's ancestor was the serpent. It was given this name because of its snakelike shape. The serpent was invented by Edme Guilliame of Auxere.
http://www.dwerden.com/forum/content.php/124-an-historical-lineage-of-the-modern-baritone-horn-and-euphonium#.VhRNeIgVT7Y -
Ophiclide
The ophicliede is another ancestor of the euphonium. It was invented by Jean Hilaire Aste. It was similar to the saxophone, but was played with a mouthpiece.
https://prezi.com/aip20zyejeo3/the-euphonium/ -
First Euphonium
Sommers of Weimar usualy gets the credit for inventing the first euphonium in 1843. It was designed to replace tenor tubas. It was a in the shape of a wide, valved bugle.
http://www3.nd.edu/~baritone/history.html -
Phasey Enlarges Bore
Alfred James Phasey made the width of the euphonium's bore larger. He did this once in 1859. He did it again in the 1870s, probably to improve it.
http://www3.nd.edu/~baritone/history.html -
Blakely's Valve System
Dr. David Blakely created a new valve system for the euphonium. This helped it to have a better tone quality. It worked so well that the companies that manufactured instruments used it as soon as the patent ended.
http://www.davechilds.com/reviews-and-articles/article=the-history -
Double-Bell Euphonium
Around the 1880's, the Conn company invented the double-bell euphonium. It was meant to combine the sounds of the euphonium and trombone. It did not last.
http://www3.nd.edu/~baritone/history.html -
Today's Euphonium
Stephen Mead improved the euphonium by adding a tuning slide. He worked with Boosey and Hawkes. This euphonium is the most common today.
http://www.davechilds.com/reviews-and-articles/article=the-history