Nazulu said:
The Four Horsemen by Metallica (1983) http://www.youtube.com/watch?v=C4nCy5CITc8
Mechanix by Megadeth (1985) http://www.youtube.com/watch?v=0esBAj3ZoaY
Preferred if they just made a cover because I prefer The Four Horsemen.
The Four Horsemen originally was Mechanix, Dave Mustaine wrote it and Metallica played it live before he left, after Mustaine left James Hetfield changed the lyrics, added the bridge and it became The Four Horsemen. The song is actually credited to Mustaine, as are quite a few other songs from Kill 'Em All and Ride The Lightning. Technically Metallica copied Dave Mustaine.