Simple enough, what's grabbed your attention? You booted a game up and you hear the music flood into your ears and you're simply left without thought. Just embracing the glorious music which sends you into an array of killing shit with style. I've played many games, all with beautiful - awful - good soundtracks and intro music which is just amazing. However if I had to choose, it would be "Sprit of Fire" theme from Halo Wars. It grabs everything I love about the game perfectly, also throw in the nostalgia. Song by Martin O'Donnell, Michael Salvatori, and Stephen Rippy.