Another classic Metallica cover is done by Pat Boone on In a Metal Mood: No More Mr. Nice Guy. It's really quite inspired to arrange Enter Sandman with a full big band. Meanwhile, for bluegrass metal, the Austin Lounge Lizards do a great cover of Pink Floyd's Brain Damage. You can legally download the MP3 for free from Amazon.

(I heard this song performed live by the Lizards before I knew they covered it. I had no idea what it was for the first ten seconds. I think I nearly snorted my beer out my nose once I figured it out.)