I didn't do the sound effects, I used a sound effect from a sound effect library.
As for the music, I didn't really make that either but it was a bit more than simplay using a piece of music. I used Ecrett Music for that. With that I generated a piece of music with a fitting theme. And i made some slight modifications, but not much.
So it's a bit more effort than just using an existing piece of music, but not much. :D