The opening riff in these three songs are too similar to be coincidence: (the Marley song is more of a theme than a riff)
- No Woman, No Cry - Bob Marley (1975)
- The Last In Line - Dio (June 1984)
- Fight Fire With Fire - Metallica (July 1984)
There is a definite classical element to the guitar, so I suspect the inspiration to be a passage from some classical piece.
Can anyone say with surety from where this may have been 'appropriated'?