ID3 tags for your MP3s
The common mp3 file that everyone and their mother and some peoples grandmothers have contain metadata. This is data that is embeded in the MP3 file which is editable. That is how when your favorite Micheal Jackson song plays on your iPod you can see the Album, Artist, Track number, Song name, and even Album art. Popular players such as iTunes, Windows Media Player, Winamp all have databases that they go to when you insert a CD to convert to MP3 files to find this information. If for some reason you have a not so popular CD the specific program will default to Unknown Album and default song names to Track 1, Track 2, and so on. these are ID3 tags. I am sure anyone who has an MP3 player who has ripped their own music has found 2 listings of the same musician like LeCrae and Le Crae which can get very annoying. Really this is an easy fix. There are a cople different ways you can do correct this.
Using software
For this method I would suggest a few different methods depending on how you will edit this (one at a time or in bulk).
1. MP3 Tag This is really the best free program around for modifying ID3 tags especially in bulk. This program will not only just edit your MP3 tags but allow you to setup automation to name your music all the same way, export ID3 tags, connect to the Freedb for querying song names, and even convert ID3 types. Two great places too look for help on using this if you get lost are - Anythingbutipod.com tutorial or MP3Tag forums
2. iTunes - yes you can manage ID3 tags in iTunes. The easiest way to do this is by going to the list view where all songs are listed out and select either one song at a time or CTL-Click and select multiple songs. right click on the song select get info and go to the info tab. Here you will be able to modify the ID3 tag. As for the album artwork there is a separate tab for that. Just know that if yo update it in your computer you will need to re-sync or send over the new file in order to have the updated copy on your iPod.
3. Dbpoweramp - This program is free to try as a trial and reverts to the free version after 30 days. I actually bought this program because I found it easy to to use to convert multiple files at once for a big project I was on. One installed and your computer has been rebooted you will find a new option on your right click menu called edit ID Tag. By clicking on this you can instantly edit any mp3 tags just by finding the file on your computer.
Using Windows XP (not sure about Vista)
Tags can also be modified through the windows file properties interface. To edit this way find an MP3 file, right click select Properties, and go to the Summary tab. Once there click the Advanced >> button near the bottom and from here you will be able to edit the basics of the mp3 tags. The only drawback to this method is you can only edit one at a time and I have yet to find out how to modify the album art through this method.
For more info on updating your MP3 collections albulm art check here
More info on ID3 tags can be found at the below listed sites