This book is a contribution to our knowledge and understanding about an instrument that deserves much more credit and respect than it generally receives. Its tonal qualities cannot be compared to any other instrument. In this book you will find answers to several questions such as - 'Why do we name this instrument both alto horn and tenor horn?' - 'What's the difference with the E flat horn?', - 'In which ensembles can it be found?', - 'What's the musical role of the instrument?', - 'Is there any original repertoire for it?', - 'When did composers start to write for the instrument and how did the repertoire evolve?