All-Star Grammy concert

Singer Lady Gaga performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. The star-studded tribute was held to mark the would-be 100th birthday of legendary performer Frank Sinatra on December 12. REUTERS/Steve Marcus

Singer Lady Gaga performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Producer Seth MacFarlane performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Actor Jeremy Renner speaks during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Musician Juanes performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Nick Jonas performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Musician Zack Brown smiles as he performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Actor Robert Patrick speaks during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Musician Adam Levine gestures as he performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Usher performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Musician Alicia Keys performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Producer Quincy Jones (L) and rapper LL Cool J speak on stage during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Trisha Yearwood performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Carrie Underwood performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Tony Bennett performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Sam Smith performs in a pre-recorded video shown during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Celine Dion performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Nancy Sinatra walks on stage during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singers Nancy Sinatra and Harry Connick Jr perform during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Harry Connick Jr. performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Musician John Legend performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singers Carrie Underwood, Zack Brown and Seth MacFarlane (R) perform during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singer Garth Brooks performs during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Singers Katharine McPhee and John Legend perform during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Grammy producer Ken Ehrlich speaks on stage during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

Musicians Tony Bennett and Lady Gaga hug in the audience during Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus

General view of the Sinatra 100 - An All-Star Grammy Concert in Las Vegas, Nevada December 2, 2015. REUTERS/Steve Marcus