When saving Tag informations, there's no way to actually "apply" them.
Sorry for the inaccurate description but I'm not that familiar with mp3 tag stuff. Anyway here's what I'm doing:
mp3 = Mp3AudioFile(whatever) mp3.tag = Tag() mp3.tag.album = "foo" mp3.tag.save(mp3.path)
Changes are not seen in windows explorer or other audio libraries like Zune. However, when using the mp3 player VLC, I hit CTRL+i to see the metadata, and the album value is correctly set to "foo". But I need to hit the VLC button "write metadata" so that changes are visible from windows explorer.
I'm probably missing a step here but I didn't find anything in the doc to "write metadata". If I'm misusing the package, feel free to invalid this issue.