the horn is unique among orchestal instruments. not only in the the keys art operated with the left hand, but because it is also played backwards, with the bell facing towards the rear of the orchestra. It is the most expressive brass instrument in the orchestra. and also the most difficult to play. The normal position for the right hand is with all fingers close together against the far side of the bell and with the thumb cluse against them. The hand is cupped and can be straightened to sharped various harmonics, while increased cupping of the hand flattens the harmony.