I Found My Horn is a book by British columnist Jasper Rees, first published in hardback in 2008, and adapted for the stage later in that year.
It is a semi-autobiographal story that follows Rees as he turns forty and decides to reunite himself with his French horn, an instrument he gave up upon leaving school, along with his mentor Dave Lee.
Rees was already writing a regular arts column for the Daily Telegraph and the early beginnings of his book can be seen in a 2005 article.
After his wife heard and recommended the Radio 4 broadcast, actor and playwright Jonathan Guy Lewis approached Rees about a stage version.
It then opened at the Tristan Bates Theatre, where it was reviewed as 'very funny' and 'a celebration of the joyous, life-affirming power of music' by The Times.