Francis O'Neill (1848-1936) is the most famous and influential collector of Irish traditional music, and "The Dance Music Of Ireland", better known as "O'Neill's 1001", is the single most popular collection of Irish dance music ever printed. First published in 1907, it has never been surpassed as the standard reference for traditional musicians. Indeed, it has circulated so widely over the years that is has become known as "The Book" - a virtual bible for those who love Irish traditional music.