iTunes like features ?

[Bram Van Steenlandt]

Hi

I  am working on something that requires the pc to play mp3 continiously
The pc does however has other tasks than this an once in a while the mp3 
stops (when you start mozilla for example)

with apple and iTunes he tune keeps playing no mather what you do (it is 
compiled into the kernel or something).

Can I do this with freebsd, can I say something like:
This program got to have 10% of the available cpu and disk time or 
something like it ?

thanks in advance