You can make your own music folder on your Pre when connected through USB. Actually, you can call it anything you want as long as there are music files in it. I rip my own music from CD or stuff I have purchased from other stores into mp3 files. Dropped them into a folder called music on the Pre and now I can play them with no problem.
Originally Posted by dolphinsexed
According to the Pre user manual, it will only play certain types of files:
You can play music that you copy from your computer or stream from the Web in the following formats: MP3, AAC, or AAC+ format. For files received as email attachments, you can play files in the MP3, AAC, AAC+, WAV, AMR, or QCLEP format.
But if you do make a Music folder, I beleive you cannot make subfolders under that (like artist or album folders) because the Pre will only see 1 folder deep. Or at least I think that is what someone posted earlier. I haven't tried it yet to verify.