You might have downloaded or transfer music onto your Android phones or tablets and then find they display the title, album, or artist displayed incorrectly. You probably have to change the wrong ID3 Tags or META Data on the computer. With android app, it is easy to do that on your nexus 7.
How to edit/modify Music Tags on nexus 7
* iTag - Music Tag Editor is a profressional music tag editor, supporting standard id3 tags and working with mp3, ogg, m4a and flac files.
* I have got a bunch of unknown artists incorrectly and it saves all corrections. Works most of the time. iTag exactly help me organize all music on my tablet.