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. Mutagen was previously an integral part of Quod Libet, starting with release 0.19 of QL it has been separated as it's own package.
Created attachment 83699 [details] Proposed ebuild for mutagen-1.0
Kia, thanks for submitting the ebuild. I've added it (slightly modified) to CVS.