Half brothers song title?

In the movie "Half Brothers" on Netflix there's a scene (31:19) in which a song is played, does anyone know what the song is called?

I don't mean the song with Excalibur but the one that is played before the brothers leave, which says "you mum is a bxstrd your father is a bxstrd we're all bxsrdts

Just download Shazam

You should think so.