Metallica's Grammy performance of "Moth Into Flame" with Lady Gaga experienced now infamous technical difficulties where James Hetfield's microphone was malfunctioning. Now, you can hear what the collaboration should have sounded like as Gaga has uploaded footage off their full dress rehearsal at the awards.

This was a full-blown dress rehearsal with backup moshers onstage, cued lighting and plumes of fire to coincide with the song's title. Here, Hetfield's mic was working just fine and we get to experience the true power of this joint effort as he parries lines with Gaga, who uses a gritty delivery of her own to mirror the frontman.

Since the event, the Grammys have offered an apology to Metallica, suggesting that an onstage extra may have possibly kicked out the microphone cable prior to the live performance. Hetfield kicked over his mic stand and threw his guitar toward his guitar tech and later drummer Lars Ulrich described his bandmate as "livid," adding "I haven't seen him like that in 20 years." According to Ulrich, this may not be the last we see of these two sides working together. See the live set below.

The day after the Grammys, Metallica —one of the Top 50 Hard Rock + Metal Live Acts of All Time — announced a long-rumored North American stadium tour, electing to bring Avenged Sevenfold, Volbeat and Gojira on the road with them with each playing select dates on the trek. Head to our 2017 Guide to Rock + Metal Tours to see all the stops before getting your Metallica tickets.

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