French Horn 

 

The modern orchestral brass French horn was an invention based on early hunting horns. Horns were first used asmusical instruments during 16th century operas. During the 17th century, modifications to the bell end (larger and flared bells) of the horn were made and the cor de chasse, or French horn as the English called it was born.

The first horns were monotone instruments. In 1753, a German musician called Hampel invented the means of applying movable slides (crooks) of various length that changed the key of the horn.