easiest method is songdetails..
for read data
import songdetails
song = songdetails.scan("blah.mp3")
if song is not None:
print song.artist
similarly for edit
import songdetails
song = songdetails.scan("blah.mp3")
if song is not None:
song.artist = u"The Great Blah"
song.save()
Don't forget to add u before name until you know chinese language.
u can read and edit in bulk using python glob module
ex.
import glob
songs = glob.glob('*') # script should be in directory of songs.
for song in songs:
# do the above work.