The following instructions will give the details on how to load album art so that it shows on your G1.
First, an explanation as to why some do, and some don't:
The Amazon mp3 system encodes a small image into every track. This image is the album art. If you look at your G1 as a file storage unit, you'll see a file named "album thumbs". This is the folder where all the album art is stored which is pulled off the tracks when you add them. It is not possible to manually add album art by adding the images to this folder so don't try.
What this means is that any
music files pulled off of Amazon, iTunes, or other providers that encode this image into the individual tracks will have album art, others will not. What you need to do to get yours to show up is encode the images yourself, this is astonishingly easy and all you need is Windows Media Player. (I am not sure if it works with other media centers, I only use WMP so it's all I have experience with.)
Step 1: Download the album art as an image. You can probably find a
picture of the CD cover on Amazon.com, Towerrecords.com, or a host of other cd sites. Be sure to save this in a place you can find it later. Jpeg is recommended.
Step 2: Load your album into Windows Media Player. This entails either saving the already ripped files so they show up in WMP, or ripping them off of cd using WMP.
Step 3: From the library, open the album you wish to add art to. Select all the tracks and right click.
Step 4: On the right click menu, choose "advanced tag editor".
Step 5: Select the tab that says
pictures. Click "Add". Select the image you saved as the album art and accept it. Then use the drop down menu to select "Cover Art". Press Ok and you are done.
Voila! Album art when you then copy those files over to your G1. The images will automatically be loaded into the file "albumthumgs" the first time you play a track from the album and will show up in your G1 media player shortly after. Hope this helps.