I just watched the trailer of Fierce People (http://media.movies.ign.com/media/903/903820/vids_1.html) and noticed that in the beginning and the end there are what appear to be well known songs but they're actually messed up versions of them. The music in the beginning seems to be Under Pressure by Queen, and in the end sounds like Bittersweet Symphony by The Verve. Was this done for budget reasons (not having to buy the rights to the actual songs) or does it have a meaning?