Sherylcrow_51stannualgrammyawards09_240 We don’t know exactly what’s going to happen on the season finale of “30 Rock” next month, but our best guess is that it will be melodious.

The guest star-happy NBC comedy has lined up a big roster of musicians for its finale on Thursday, May 14. The network isn’t being too forthcoming on what they’ll all be doing, saying only that the finale will be a “special episode featuring Alan Alda and surprise musical guests.”

Alda, the Emmy-winning star of “M*A*S*H” and the final season of “The West Wing,” will appear in the season’s final two episodes. In the finale, he’ll be joined by music stars Elvis Costello, Sheryl Crow, Mary J. Blige, Clay Aiken and Adam Levine of Maroon 5. Sherri Shepherd will also reprise her occasional role as Tracy’s (Tracy Morgan) wife.

Whether all those guests will be good for the show remains to be seen. A few of the “30 Rock” guests this season — notably Salma Hayek, who will be back in Thursday’s (April 23) episode — have blended in seamlessly with the show, but others (Steve Martin, Jennifer Aniston to a degree) haven’t been as successful.

May sweeps, which actually start Thursday, will also feature the return of Steve Buscemi (this week) and Elaine Stritch (April 30) to “30 Rock.”

Posted by:Rick Porter