Each file represents one track with all the related information (artist information, release information, audio analysis of the track, etc). Usually one track is one song, although there are multiple versions of the same track for many songs -- extended versions, different releases, etc. -- each in its own file.
Remember the some songs are released many times with slight differences (e.g. US versus European release).
The actual file format of each file is HDF5. A schema of the inner organization of a HDF5 song file can be found here.
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