Tonight’s 48th annual Grammy ceremony (CBS, 8 p.m.) may clock in at more than three hours, but it should be jam-packed with spectacle. Here’s what to watch for:

1. The duets Who’s more animated: the rejuvenated-in-2005 Madonna (pictured) or cartoon quartet Gorillaz? We’ll find out in the opening moments of the ceremony when they kickoff the show with their unlikely mash-up. Tonight’s show is all about such stage pairings, including U2 and Mary J. Blige, Jay-Z and Linkin Park, Mariah Carey and the Love Fellowship Choir, Christina Aguilera and Herbie Hancock, Faith Hill and Keith Urban, the inevitable Kanye West and Jamie Foxx, and Bruce Springsteen and a surprise partner. There’ll be about 20 performances in all, including Kelly Clarkson, Coldplay, and Paul McCartney, who’s finally making his Grammy show debut.

2. The tributes Will reclusive funk pioneer Sly Stone show up? Don’t know, but if he does, he can join a tribute medley of his own hits, performed by John Legend, Maroon 5, Black Eyed Peas’ Will.I.Am, Ciara, Joss Stone, Robert Randolph, and Aerosmith’s Steven Tyler and Joe Perry. There’ll also be the obligatory post-Katrina homage to New Orleans, with Elvis Costello, Bonnie Raitt, U2’s the Edge, Springsteen, and Sam Moore joining Crescent City musicians Dr. John, Allen Toussaint, and Irma Thomas.

3. The presenters What’s Tom Hanks doing here? Or Matt Dillon? Or Jennifer Love Hewitt, Teri Hatcher, Jenna Elfman, Terrence Howard, Lance Armstrong, Ellen DeGeneres, and Dave Chappelle? They’ll be introducing musical acts and handing out trophies, as will actual musicians such as Big & Rich, Michael Bublé, Common, Queen Latifah, LL Cool J, Ludacris, Destiny’s Child, James Taylor, Alicia Keys, Fiona Apple, and Sheryl Crow.

4. The egos It’ll be interesting to see if West (who’s up for eight awards, tied with Carey and Legend for the most nominations tonight) will upstage his duet partner Foxx, or if the recently split Armstrong and Crow will have to share a stage. Chappelle will probably get an ovation just for showing up. And we can’t wait to see what fashion risk Carey will squeeze herself into. Stay tuned.

5. The awards Yeah, somewhere in the midst of all the live performances and whatnot, they’ll actually hand out trophies in about a dozen of the 108 awards categories. (The rest will have been given out in an untelevised ceremony this afternoon.) That works out to about one acceptance speech every 15 minutes. Mad props to God, y’all. And to Clive Davis.

Check back in to during the ceremony, as a panel of several of our music department’s staff writers will be conducting a live running commentary throughout the show.

addCredit(“Madonna: Jun Sato/”)