The transition from the natural horn to the valve horn

The transition from the natural horn to the valve horn。Please specifically focus on music demonstrating the transition from natural to valved horn。Here are Some articles you can read it and get some ideas.

http://www.public.asu.edu/~jqerics/why_valve.htm

http://www.public.asu.edu/~jqerics/lewy_beethoven.htm

http://www.jstor.org.ezproxy.bu.edu/stable/765964?Search=yes&resultItemClick=true&searchText=valve&searchText=horn&searchUri=%2Faction%2FdoBasicSearch%3FQuery%3Dvalve%2Bhorn%2B&seq=1#page_scan_tab_contents

http://www.historicbrass.org/Portals/0/Documents/Journal/1997/HBSJ_1997_JL01_005_Ericson.pdf

http://www.public.asu.edu/~jqerics/la_juive.htm

http://www.public.asu.edu/~jqerics/earlval.htm

http://www.public.asu.edu/~jqerics/meifred.htm

http://www.public.asu.edu/~jqerics/original_kopprasch.htm

http://www.public.asu.edu/~jqerics/lewya.htm