Ah I see... Misunderstood you then. In that case :
I'd say head over and download ID3Tag-It ( http://download.cnet.com/ID3-TagIT/3000-2169_4-10544467.html) and then plug your phone in and open the app, then in the browser Window on the left side of the app, point it to the folder on your phone/SDcard and you can edit them right there :-)
Hope that helps!
EDIT: Also, if you want the ability to edit the tags on your phone or in the go, check this app out in the play store, let's you edit the tags directly on your phone and had the ability to edit multiple ones at once if I remember correctly, don't hold me to it though haha ( https://play.google.com/store/apps/details?id=com.ADnet)