AC/DC had one of the greatest musical impacts on the music industry. They were founded in 1973, six years before Metallica, and they established the benchmark for that genre of music. They weren't like anything else folks had ever seen or heard. Angus Young running around on stage in his schoolboy outfit while performing his version of Chuck Berry's Duck Walk and playing the classic Gibson SG in the style of AC/DC was just iconic, and people loved it.

In a tribute video to Malcolm Young (Angus's late but great older brother), Scott Ian, the Rhythm Guitarist of the band Anthrax, one of the 'Big 4′ in Thrash Metal, revealed that Malcolm was his guitar idol and that he learnt how to play a guitar by ear while listening to Malcolm.

Apparently, Alex Webster (Cannibal Corpse's bassist) mentioned that when he was beginning to play bass, he was influenced by AC/most DC's prominent bassist Cliff Williams, and that he probably learnt a few AC/DC songs.

Kurt Cobain (the late but legendary vocalist and guitarist for the famed grunge band Nirvana) also drew inspiration from AC/DC.

On the other hand, Metallica was one of the first bands to popularize the thrash metal genre. Thrash merged elements of punk and heavy metal to create a stronger, more aggressive sound with extended pieces.

While Angus Young undoubtedly encouraged innumerable others to pick up a guitar, Metallica has inspired a slew of metal bands to go out and grind, grind, grind until they land a record deal and a fan base.

That is just what Metallica has done. They cultivated a following. Metallica didn't release a music video until its fourth album, at a period when MTV was a necessary evil for a band to gain national attention.

So which one in your opinion has a bigger impact on the music industry?