LOS ANGELES, CA - FEBRUARY 12: Musician James Hetfield (L), of Metallica, and singer Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)

LOS ANGELES, CA - FEBRUARY 12:  Musician James Hetfield (L), of Metallica, and singer Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.  (Photo by Jeff Kravitz/FilmMagic)

LOS ANGELES, CA - FEBRUARY 12: Musicians James Hetfield of Metallica (R) and Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Lester Cohen/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12:  Musicians James Hetfield of Metallica (R) and Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.  (Photo by Lester Cohen/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12: Recording artists James Hetfield (L) of music group Metallica and Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12:  Recording artists James Hetfield (L) of music group Metallica and Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.  (Photo by Kevin Winter/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12: Recording artist Lady Gaga (L) and recording artist James Hetfield of music group Metallica perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12:  Recording artist Lady Gaga (L) and recording artist James Hetfield of music group Metallica perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.  (Photo by Kevin Winter/Getty Images for NARAS)

LOS ANGELES, CA - FEBRUARY 12: Recording artists James Hetfield (L) and Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)

LOS ANGELES, CA - FEBRUARY 12:  Recording artists James Hetfield (L) and Lady Gaga perform onstage during The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California.  (Photo by Kevork Djansezian/Getty Images)