ID3
From Just Solve the File Format Problem
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Overview
ID3 is a metadata format, used mainly in MP3 audio files. It stores information such as the song title, artist, and album.
Format
There are two major versions. ID3v1 defines a fixed-length data block that is always placed at the end of the file. ID3v2, which has very little in common with ID3v1, defines a block with variable-length frames and allows more flexibility and verbosity.