When I got my webjal/myjal it came w/ two cds... both containing music/wallpapers/etc. well one of the cds also comes with a wav creator, but if you wish to get a mp3 file and convert it to wav... try going to www.download.com and downloading a "wav to mp3 converter". Search it as: "wav to mp3 converter". some free/shareware software will pull up.
also before you convert the file its gonna be to large for the phone most likely. so what you do is go to a torrent site or try to find a software online that also you to split the mp3 before you convert it... so you can cut what part you want then you convert it. The program I found a while back was "splitter and joiner"