Photos: Rock In Rio underway: Week One

James Hetfield fronts Metallica as drummer Lars Ulrich fills the background screen.

A woman walks past illuminated art as night descends on Rock in Rio in Las Vegas on Saturday.

Music fans take in a late night fireworks show at Rock in Rio in Las Vegas.

James Hatfield fronts the L.A. heavy metal band Metallica at Rock in Rio.

Chester Bennington fronts Linkin Park Saturday night.

Fans wait at the barricades for the L.A. heavy metal band Metallica at Rock in Rio in Las Vegas on Saturday.

Linkin Park performs at Rock in Rio in Las Vegas.

Dancers perform on a side stage at Rock in Rio in Las Vegas.

Gwen Stefani fronts No Doubt at Rock in Rio in Las Vegas.

Lead guitarist Zach Blair gets some ait time while performing with the Chicago-based, melodic hardcore rock band Rise Against at Rock in Rio.

Tim McIlrath, lead singer for the Chicago-based, melodic hardcore rock band Rise Against, wades into the crowd at Rock in Rio.

LAS VEGAS, NEV. - MAY 9, 2015.Lead guitarist Zach Blair performs with the Chicago-based, melodic hardcore rock band Rise Against at Rock in Rio in Las Vegas on Saturday, May 9, 2015. (Luis Sinco/Los Angeles Times)   (Luis Sinco / Los Angeles Times)

Gwen Stefani fronts the Orange County rock band No Doubt at Rock in Rio in Las Vegas.

Gwen Stefani fronts No Doubt at Rock in Rio in Las Vegas.

Gwen Stefani fronts the Orange County rock band No Doubt at Rock in Rio in Las Vegas.

Fireworks light up the night at Rock in Rio.

Gwen Stefani fronts No Doubt at Rock in Rio.

A fan records a performance by the Mexican rock band Mana at Rock in Rio in Las Vegas.

Fher Olvera fronts the Mexican rock band Mana at Rock in Rio in Las Vegas on Friday, May 8.   (Luis Sinco / Los Angeles Times)

Sergio Vallin plays guitar for the Mexican rock band Mana at Rock in Rio in Las Vegas on Friday, May 8.

A roadie prep[s the stage for the Mexican rock band Mana at Rock in Rio in Las Vegas on Friday, May 8.   (Luis Sinco / Los Angeles Times)

Mark Foster fronts Foster the People at Rock in Rio in Las Vegas on May 8.

Fans cheer during a performance by Foster the People at Rock in Rio in Las Vegas on May 8.

Fans pose for pictures at Rock in Rio in Las Vegas on May 8.

Taylor Momsen performs at Rock in Rio in Las Vegas on May 8.

Taylor Momsen, left, fronts the New York City-based rock band The Pretty Reckless during a performance at Rock in Rio in Las Vegas on May 8.

Storm clouds drift over the horizon as night falls on Rock in Rio in Las Vegas on May 8.

Guitarist Gary Clark Jr. performs at Rock in Rio in Las Vegas on May 8.

Guitarist Gary Clark Jr. performs at Rock in Rio in Las Vegas on May 8.

The crowd applauds a performance by guitarist Gary Clark Jr. at Rock in Rio in Las Vegas on May 8.

Performers with Cirque du Soleil get the action started with an acrobatic dance number May 8 at Rock in Rio in Las Vegas.

Performers with Cirque du Soleil get the action started with an acrobatic dance number May 8 at Rock in Rio in Las Vegas.

Ricardo and Vanessa Guerra of Rio de Janeiro renew their wedding vows May 8 with the help of an Elvis impersonator at Rock in Rio in Las Vegas.

A sparse crowd gathers in the afternoon May 8 at Rock in Rio in Las Vegas.

A performer with Cirque du Soleil gets the action started May 8 with a trapeze act at Rock in Rio in Las Vegas.