Spoiler alert!

What to expect on tonight's Grammy nominations concert broadcast.
Five categories will be announced on air: Album of the year; song of the year; record of the year; pop collaboration with vocals; and rap performance by a duo or a group.
The songs selected for the telecast are all in the Grammy Hall of Fame, which ties in with the Grammy Museum that opens to the public on Saturday. Of course, this is live  TV and anything might change.

Songs and the performers:
Mariah Carey gets the Darlene Love hit "Christmas (Baby Please Come Home)."
Celine Dion will sing Janis Ian's "At Seventeen" and throw in her own "My Love."
Foo Fighters get Carly Simon's "You're so Vain," most likely sans Mick Jagger in the background.
Xtina sings Gershwin: "I Loves You Porgy"
Taylor Swift gets Brenda Lee's classic "I'm Sorry," which she will segue into her own "White Horse."
And B.B. King will perform Louis Jordan's "Let the Good Times Roll," a song he has used to open countless concerts.

Expect more blog entries during the telecast.