http://www.python.rk.edu.pl/w/p/podstawy-pygame/
https://www.pygame.org/wiki/tutorials#Italian
https://www.pygame.org/docs/ref/key.html
https://www.pygame.org/docs/ref/rect.html
https://stackoverflow.com/questions/6004887/in-pygame-how-is-it-if-even-possible-to-play-more-than-one-song
https://www.pygame.org/wiki/GettingStarted