"Sad but True" is a song by Metallica which is about drug or alcohol addiction. "I'm your dream, mind astray, I'm your eyes while you're away, I'm your pain while you repay," and "You're my mask, you're my cover my shelter" James Hetfield got the idea for this song from the 1978 Anthony Hopkins film Magic, which is about a ventriloquist who is controlled by his evil puppet. Kid Rock sampled this in his song "American Badass." (thanks, Bertrand - Paris, France) Like, "Thing That Should Not Be," this was written and performed in standard-D tuning for guitar.