Audio tag tools

Mutagen is an audio metadata tag reader and writer implemented in
pure Python.
It supports reading ID3v1.1, ID3v2.2, ID3v2.3, ID3v2.4, APEv2, and
FLAC, and writing ID3v1.1, ID3v2.4, APEv2, and FLAC.

The goals are (in rough order of importance):
* Read as many files as possible
* Compatibility with as many other tag readers and editors as possible
* Compliance with the relevant specifications
* Written in Pythonic Python, with a Pythonic API
* Unit and regression test suite
* Provide access to all features of the supported formats
* Easily extensible