… of sound or of other phenomena, whether or not recorded, including matrices and masters for the production of discs, but excluding products of Chapter 37. …
Explanatory notes
… of sound or of other phenomena, whether or not recorded, including matrices and masters for the production of discs, but excluding products of Chapter 37. - Magnetic … of having more information recorded on them. This heading includes media in intermediate forms (e.g., matrices, master …