Google translated that as:
Good to all the question I have is if I can execute 2 or more methods at once, I have a game to which I have to put a song in the background and I wanted to know how to do it and how to do the rhythm I only need to execute the game and the song at a time and that none pause the other method I am new to arduino apologize ignorance and if you know of one could write two very easy methods to understand please thank you
No, you can not do two things at the same time on a microcontroller with a single processor.
There is no "background" for you to put a song in.