I personally dislike the iPod_Control>Music folder. If I were you, I would not start converting tags or such, I would delete the files that you have put on your iPod using Winamp and copy all files (that do have correct id3-tags, right?) to your iPod again using drag&drop. Rockbox does not require software to organize your files on your device and if the tags are fine they are shown correctly on the wps.