nonlinear programs?

[Jeremiah Rogers]

Is there a way for me to make python start a process(such as mpg123) and
then continue on in the program before mpg123 stops? I want to be able
to start the song playing, and then still solicit user input about
skipping on to the next mp3, or quitting the program. If someone could
explain this to me, or point me in the direction of an explanation I
would be very greatful.