There are paid apps that will import music, videos, ringtones, contacts, etc. from apps, but you can do this for free with iFile. You just need to install the free Gremlin Library in Cydia and respring first. After installing it you'll see "Add to iPod library" at the bottom of the file attributes. For example, below is a screenshot of the file atributes of an .mp3 used in GTA Vice City. After selecting the add to library option, it automatically synced to my iTunes library and then showed up in my iPod app.
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