<Tr> <Td_colspan="7"> 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 . Kate Walsh makes a guest appearance as Addison Montgomery . </Td> </Tr> <Tr> <Th> 145 </Th> <Td> 19 </Td> <Td> "It's a Long Way Back" </Td> <Td> Steve Robin </Td> <Td> William Harper </Td> <Td> April 28, 2011 (2011 - 04 - 28) </Td> <Td> 10.67 </Td> </Tr> <Tr> <Td_colspan="7"> Everyone pulls together to help Callie and baby Sofia on their painstaking journeys to recovery in hopes of allowing mother and baby to finally meet; the sudden death of a clinical trial patient has Derek proceeding with more caution while Meredith makes a calculated and risky move; Alex treats a cranky old rich woman dying of cancer and gets an idea for a grandiose endeavor that is sure to get him the Chief Resident spot; and Teddy is pleasantly surprised by the return of a familiar face . </Td> </Tr> <Tr> <Th> 146 </Th> <Td> 20 </Td> <Td> "White Wedding" </Td> <Td> Chandra Wilson </Td> <Td> Stacy McKee </Td> <Td> May 5, 2011 (2011 - 05 - 05) </Td> <Td> 10.11 </Td> </Tr>

Does callie's baby die in season 7