The Heckel system is the more complicated, but tonally more expansive key setup on a bassoon.
It is unclear who the original inventor is, since some details of history have been erased from our knowledge. For information concerning the bassoon and some of it's history, see the wikipedia.org article at: http://en.wikipedia.org/wiki/Bassoon
Yes, the trumpet has changed over time. It started as one long tube and where the notes were restricted by the changes in lip vibration to the one we see now where valves assist along with lip structure to change and form more of the notes we need
System of a Down does not have a song titled System of a Down. Their first studio album, however, was titled System of a Down. This is known as a "self-titled" album.
twelve-tone system
System Of A Down's manager was Beno.
Vilém Heckel was born in 1918.
Vilém Heckel died in 1970.
Erich Heckel died in 1970.
Erich Heckel was born in 1883.
Wilhelm Heckel GmbH was created in 1831.
Johann Adam Heckel was born in 1812.
Johann Adam Heckel died in 1877.
Édouard Marie Heckel died in 1916.
Édouard Marie Heckel was born in 1843.
David G. Heckel was born in 1953.
Johann Jakob Heckel was born on 1790-01-23.
Johann Jakob Heckel died on 1857-03-12.