TOP PICK: ‘Grey’s Anatomy‘ (9pm ET on ABC)

In a series first, the music that has been at the heart of the show and been beloved by fans comes to life for ‘Grey’s Anatomy: The Music Event.’ A cataclysmic event rattles the doctors of Seattle Grace to the core, as Callie, on the verge of an enormous life-changing moment with Arizona, envisions her hospital and friends as it has never-been-seen before. “Chasing Cars” (Snow Patrol), “How to Save a Life” (The Fray) and “The Story” (Brandi Carlile) are among the songs performed by the cast.

KEY EPISODE: ‘American Idol‘ (8pm ET on Fox)

After last week’s judges save of Casey Abrams, not one, but two of your favorites will be eliminated tonight.

WATCH: ‘CSI‘ (9pm ET on CBS)

Watch Episodes On Demand

A string of deaths, including a gamer found dead on his couch and a newly divorced man at the bottom of a pool, instigate a bet among the CSIs as to whether they’ve “hit for the cycle” – a homicide, a suicide, an accidental and a natural death all in one night.

DVR: ‘The Big Bang Theory‘ (8pm ET on CBS)

When someone hacks Sheldon’s online game account, the guys go on a quest to find the culprit.

DVR: ‘Jersey Shore‘ (10pm on MTV) **Reunion**

Watch Episodes On Demand

After another season of hot tub hookups and plenty of Ronnie/Sammi drama, the entire gang gets together to hash things out before their upcoming trip to Italy.

Talk Show Listings:

Live with Regis and Kelly: Jake Gyllenhaal

Late Show with David Letterman: Chris Rock

The Tonight Show with Jay Leno: Kourtney & Kim Kardashian

Conan: Johnny Knoxville

Lopez Tonight: Snoop Dogg

Jimmy Kimmel Live: David Beckham

Late Night with Jimmy Fallon: Elton John

The Daily Show with Jon Stewart: Norm MacDonald