A variant of interview, the “journalistic investigation” is very successful as soon as it appears in late 19th century France. When music is the object of the investigation, journalists mainly appeal to composers who can then append their authorized signature to their articles. While putting creators at the front of the media stage, this genre also implies that the composers’ discourse is beyond their full control: their answers are published and commented on by a journalist and then inserted into a polyphonic millefeuille, since the journalist reports the words of different personalities who get advantage of the survey to fuel the debate among peers. Considering some cases in this large corpus, this article gives an account of the issues raised by this literary genre takes and of the different forms it takes up to 1950.