Almost, on Windows the command is "start":

def callme
  system("start 2k7.mp3")
end

callme

That should launch your system's default mp3 player.  I think that will 
only work on the native windows build of ruby, not cygwin.

Chris Lowis wrote:
> I haven't got a windows system to test this on, but does this work ?
>
>  def callme
>   system("open 2k7.mp3" )
>  end
>
>  callme
>
>
> Chris
>
>