Pictures Sinatra 100 - An All-Star GRAMMY Concert December 4, 2015 / 2:08 PM CST / CBS News Rehearsals begin for SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Lady Gaga performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Lady Gaga performs at the SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Celine Dion performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Trisha Yearwood performs at the SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Alicia Keys performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Juanes performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Usher performs at the SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Nancy Sinatra and Harry Connick Jr. perform at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Katharine McPhee and John Legend perform at the SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Carrie Underwood from left, Zac Brown and Seth McFarland performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Zac Brown performs at the SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Seth McFarland performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Carrie Underwood performs at the SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved. SINATRA 100 -- AN ALL-STAR GRAMMY CONCERT Tony Bennett performs at the SINATRA 100 – AN ALL-STAR GRAMMY CONCERT in Las Vegas to be broadcast on Sunday, Dec. 6, 2015 for the CBS Television Network. Photo: Heather Wines/CBS ©2015 CBS Broadcasting Inc. All Rights Reserved.