Dear all, I am currently exploring to see how prerecorded music market evolved from the genesis. I have searched through references, but I could not find the ones with the comprehensive data about each record published, specifically the genre of music contained (e.g., operah, jazz, hillbilly, blues) and type of platform it supported (e.g., Phonograph, Gramophone). I would be truly grateful if you can suggest me some data sources so that I can get a better pictures on who manufactured what types of records in the early history. Best wishes, Jaemin