APE tag

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APE tags comprise one extant convention used to store information (metadata) about a given digital audio file. Each APE tag constitutes a discrete element that describes a single attribute of the file's contents. Each consists of a key/value pair; the key is simply a label that names the attribute, such as Year, Title, Artist, or Track Number, etc.), and associated with it is a corresponding value, namely, some information descriptive of this file, in terms of the attribute in question (e.g., 1973 for Year). APE tags can be used with .ape-formatted recordings, as well as with sound files of other audio file formats.