She's reached the point in her career where she can show up at places without pants and everyone pretends not to notice.

Gaga: “Leather shorts and stripper moves from the nineties.” Kirk: “Our fans will appreciate that part.”

A full Lady Gaga metal album with original songs might be one of my three wishes if I found a genie

Her vocals cut right through all of the guitar, drums.... most excellent.

Fun fact: Lady Gaga is three weeks younger than Master of Puppets.

"Wow... a singer that appreciates bass" - James Hetfield 2017

She has a real appreciation for metal...and she's a killer musician on a lot of levels. You can set her down at a piano with a vocal mic, and she'll just kill. She's the real deal.

No matter what style she sings, she has a lot of power in her voice. I'm not surprised to see her really belt it out with these guys while maintaining vocal composure. Many other female vocalists would try to over-sing in this situation, but Gaga doesn't need to.

Kirks face is like "Who is this lady and what happened to her pants?"

Lady Gaga should seriously consider making a side hard rock/heavy metal project, her vocals resonated really well!

She can croon it out with Tony Bennett or rock it out with Metallica. Goddam badass chick.

Man, she's a rare talent

Must be a nice change of pace for Lars after looking at James Hetfield's backside for 30

“Wow, a singer that appreciates bass.” James never misses a chance to backhand insult the bassist.

Say what you want, Lady Gaga is a true talent. Diverse, wide vocal range and seems like a total spitfire and a blast to be around.

When Lady Gaga is more metal than all the haters who think they own metal...

Badass. If I was on stage with Metallica, I'd probably forget my pants too.

"You can't do metal." "Hold my pants."

The last 7 seconds was gold. The rest was good too. Lady Gaga has a killer voice.

I hope to see more of this style from her. Shes spectacular at anything she does but this was a jaw dropper for me 💞😍

As a bassist, this made me very happy. I’ll go back to my cage now.

That body, that hair Damn James looks hot.

Love the team work love hearing the "we" a lot🥰 love all of you!😍

She is an absolute class act and one of the most professional musicians I have ever met!

Lady Gaga: dresses like absolute metalhead Metallica: dresses like they’re running to the store to grab milk and eggs

I can say I have more respect for Lady Gaga after watching this again. Instead of listening to the music, I listened to what she said. She repeatedly asked James and Lars for advice and direction on what to do, and what they thought. This was a classy gesture, and it shows that she not only has respect for their opinions but also that given her own fame, her ego is not as big as the fame either. Metallica is my favorite band, and it is nice to see a very talented pop artist that has a level head when looking at a very talented metal band and she recognizes respect for them and their musical vision. Well done Lady Gaga, you are a real person with a brain (and a nice butt).

I'm not a Gaga fan but I get goosebumps every time I hear this.

I would still LOVE to see a collaboration album between the two.

1:22 kirk hammett´s facial expression is like "wtf i´m doing here" :D

She can totally sing anything.

I love that she left crazy outfit town and that we can see more of the musician at work. Impressive. And I love the Crossovers she does! Hail Metallica🤘🤘🤘

I never would've thought it.....but man Lady Gaga can really work a Metallica song. Certainly a very talented lady to both keep up with that Metallica beat and add too the song that certain flair I didn't even know she had.

She is humble and ask questions to James and Lars how to perform perfect... taking notes and everything.. both respect each other .. nice to see this kind of stuffs

James Lars and lady gaga: (talking specifically about the music rehearsal) Rob and Kirk: yo you wanna go fishing later or something?

Damn she is such a kick ass singer. I pray one day she makes a rock record, that'd be the most badass rock record of the 2020s so far.

I'll fall'in ❤love with this collaborations.. 🤟🔥🔥

Not a Gaga-fan, but this just shows that she is just a great musician - this was epic.

I would forget my pants too if I was with Metallica

They sound amazing together! 👏 ❤️

Omg this is like two of the best in one i didnt even know this happened i was blown away!! Always been q Metallica fan, my number 1 favorite...then lady gaga singing with them just badass!!!!

3:30 kirk, my eyes are up here

Lars looks like the crazy old guy in every disaster or zombie movie that warns people about the apocalypse.

More of this please!

That was such an awesome performance. :)

James will forever be my celebrity crush. Like a fine wine... better with age

1:30 James: "Wow, a singer that appreciates bass" Also James 27 years back: Hazing the bassist

Now that's what you call real music with class. Gaga is so frigging cool!! Nova Scotia loves her!!!

I'm mostly a rock/metal guy but will admit Gaga is a guilty pleasure, cool to see this.

She has the greatest personality ....down to earth for such a superstar

4:19 *"Not again, Montreal!* 😂 I love how they even played the part of Fade to black where James got burned😂

One of my favorite tracks from Gaga is called "Heavy Metal Lover" and its in her "Born This Way" album. Now I'm convinced why

Love this guys! Lady Gaga & James are champs!

This girl is a real chameleon when it comes to music. When she first arrived, I thought she was just another Aguilera clone with a catchy hit but wow - this girl can just turn her hand to anything. Music, film, Tony Bennett, Metallica. I would like her to do a rock album. Just to know what she can bring...

She'd be a blast to work with I bet. Seems like a good sport. Too bad someone botched the live James' mic thing, would have been epic@!

I love her more for appreciating my favorite genre of music. 🤟

Id love to see a full album together!!

"Leather 'shorts', stripper moves from the 90's." "You know, our fans will appreciate that part." Gold.

" a singer that appreciates bass"...yeah James you should have done that for Jason

Sin Dudas los Mejores d todos los Tiempos I ❤️ METALLICA, un Cubano Fan

GREAT REHEARSAL

Her voice actually really fits for the genre.

At first never understood lady gaga, but through the years she has grown to the outstanding woman she is today love her

first time iv heard them sound good in 25 years lol. keep it up!

Love this moment ❤️

"Wow. A singer who actually appreciates bass." -Hetfield I laughed pretty hard at that.

She kicks ass when she's singing metal rock... Love it...

I’m in love with Lady Ga Ga. Ore now than EVER!, badass ..brilliantly sung. Awsome. Lit 🔥

I didn't know About that! Tough this is really awesome!

Before practicing with Metallica, remember kids, don't forget your pants.

Gaga is a brilliant performer.

tnx amazing😍 repeat repeat🤘💀

Her voice fits so well. There is almost too much awesome here for one stage!!!

Wow... A Singer that appreciates bass. :0 -James Hetfield.

Lady Gaga has been a fan of Metallica since forever, she's not just another dumb pop star, she's really creative and can sing and play several instruments. She's known for being versatile! She's not just Poker Face or Bad Romance she's much more!

Always loved Metallica since high school and Lady Gaga has one of the best voices out there, fucking amazing.

Wonderful Rocklady Gaga with a great voice. And great dance performance of course...❤ 🎼🎸🎙😘

3:31 kirks face, priceless

"WOW Singer that appreciate bass" hahahahahah

Would Love to hear a LP in collaboration . SOOOOOObrutal Sick!!!

One & only one my beloved band working kindness,,,, unity... Love you Metallica

Wow. Stunning. Perfection

Gaga’s voice compliments James really well here.

Killer voice ,great lady as well!

She is soooo damn good , makes the song even better

Shes ridiculously talented. She sang with Tony Bennett before this. Even took lessons before she did. True perfectionist

So, the rehearsals were actually better than the actual performance... Grammys sound engineers deserve to be fired, man.

love her. such a badass and a real artist.

When you're the most versatile singer in the Hollywood like you can do all the genre outstanding with your voice 💅💅

Say what you want, but she is a great singer and seems like a super fun/adorable person. I would love to see her singing more rock/metal stuff.

Everybody pretends that Lady Gaga has pants, lol

Yeah rock on! The best of the best together

Cool two wonderful acts

I met James and Jason newsted many years ago on a cold November night in Toronto. I was star struck. They both signed my concert ticket and I was speechless. This was long before cell phones had camera and still to this day every tie I see James play I still can't believe I shook the mans hand!! The nicest coolest dude he was too!!

I`m a metal fan since I remember, and I have to say Lady Gaga has one of the most powerful and beautiful voices I`ve heard

Seriously seriously one talented woman. She' was sent from heaven to make music 🎵🎵

Kirk's facial expression: "And that, kids, is how Introverts express their disagreements, taking care not to provoke the sense of discomfort they feel precisely".

They didn't rehearse the part where James' mic goes deaf.

Amazing......how professional committed people ....don't matters how many hours they expend......they are committed the give you a quality product........in less the 3 hours.........while they work actually a all day.......inspiring

SO GOOD

Works so well. I hope we can hear more from this collaboration. True artists, all of them.