<Tr> <Td_colspan="2"> in F: sounds a perfect fifth lower than written . Nonetheless, in older music, bass - clef notes are written one octave lower (thus sounding a perfect fourth higher than written). </Td> </Tr> <Tr> <Th_colspan="2"> Related instruments </Th> </Tr> <Tr> <Td_colspan="2"> <Ul> <Li> Tenor horn (alto horn) </Li> <Li> Baritone horn </Li> <Li> German horn </Li> <Li> Mellophone </Li> <Li> Natural horn </Li> <Li> Post horn </Li> <Li> Saxhorn </Li> <Li> Vienna horn </Li> <Li> Wagner tuba </Li> </Ul> </Td> </Tr> <Ul> <Li> Tenor horn (alto horn) </Li> <Li> Baritone horn </Li> <Li> German horn </Li> <Li> Mellophone </Li> <Li> Natural horn </Li> <Li> Post horn </Li> <Li> Saxhorn </Li> <Li> Vienna horn </Li> <Li> Wagner tuba </Li> </Ul>

How does a french horn player obtain different notes