The Horn (French Horn) is a unique instrument on many levels. It is used in bands, orchestras, solos and other musical settings. It started as a hunting horn instrument and was elevated into early music without valves, but with many crooks to change pitches.
Many years later the valve horn was invented around the time of Beethoven's 9th Symphony with the 4th player using this special design. All horn playing began to change from this sophistication of the instrument.
To this day this 4th part of the Beethoven 9th is considered one of the most difficult parts in all horn literature for Symphony music.