Capturing the music from the app. would be a lot easier.
If ya wanna extract it then try browsing the app. with resource hacker n see if you find any midi or wav files u can save.
Or it can be that the midi or wav is stored somewhere in ur windows or windows/system.
If ur familiar with decompiling n reversing then its nothing.
Many tutorials are available on the WWW.
dont use anything as geeky as the resource hacker or something like that
if you are the member of the digit community search for FLASh in the archive , digit has included several softwares for hacking all the stuff from the SWF files , but you will have register first if you want to use them
but they are very goood