What the song is that plays is called. All I remember of the lyrics are "no conscience" "just take him out, bang" I looked these up but can't find it anywhere. If anyone knows, that'd be great and very much appreciated.
Just so you know it wasn't a song. The voice narrating was the character Yup Yup. Thats the black dude in the gang of three. If you watch the DVD with commentary Dito explains that. The Voice Over says "Yup yup, that's me...". Dito did it for the sake of artistic expression, that is using another character talking while we watch another character visually.
Yep, the voice wasn't of the boy, tho. It was of his black friend which expressed what they've persuaded in him. They used the boy like their hitman, making him do their dirty job.