killing is my business... and business is good albümünün son şarkısıdır. the four horsemen ile aynıdır. ayrıca mustaine in the rude awakening konser dvd sinde bu şarkıyı çalmadan önce " there are two ways you can hear this next song, there is our way* and there is their way* for those who would think this is their way, the song is called mechanix " gibisinden ayarını da vermiştir.
