Robert Trujillo says that he was “really impressed” by Lady Gaga when METALLICA collaborated with the pop superstar at this year’s Grammy Awards.

METALLICA‘s appearance with Gaga at the 59th annual event in Los Angeles on February 12 turned into something of a disaster when the Grammy sound crew did not turn frontman James Hetfield‘s mic on, forcing him to share the mic with Gaga after the first verse and chorus.

As a further humiliation, presenter Laverne Cox did not even introduce METALLICA by name. At the end of the song, a visibly angry Hetfield hurled his guitar at a road crew member while kicking over his mic stand.

Asked by Brazil’s Cauê Moura if he has any guilty musical pleasures that some fans might find particularly surprising, the METALLICA bassist said (see video below): “In modern music, today, like what’s going on, I’m boring. I don’t have anything exciting to tell your fans about listening to Justin Bieber, ’cause I don’t. I have an appreciation for Lady Gaga, because she can really sing and I didn’t know that before her performance on the halftime show for the Super Bowl. I was impressed. Hey, me personally, I was impressed. And when I met her and I heard her singing the METALLICA song ‘Moth Into Flame’ at rehearsals, I was really impressed by her and her attitude towards, hey, music… She could play, she could sing, and it was honest and sincere and the attitude was there. I always love attitude. I love people that [approach performing like] it’s all about having fun and kicking ass.”

Shortly after this year’s Grammy Awards, METALLICA drummer Lars Ulrich told Rolling Stone that Gaga was the “quintessential perfect fifth member of this band,” saying, “Her voice, her attitude, her outlook on everything is so awesome. [The performance] was so effortless and organic and she just has the spirit of hard rock and metal flowing through her veins. It comes really easy for her. There’s nothing contrived; she just has this super warm, easy energy.”

METALLICA was up for a Grammy this year for “Best Rock Song” for the track “Hardwired” from its new album, “Hardwired… To Self-Destruct”, but lost to the late David Bowie‘s “Blackstar”.