<Tr> <Td> 2 . </Td> <Td> "Breathe" (Original by Anna Nalick) </Td> <Td> Anna Nalick </Td> <Td> Chyler Leigh </Td> <Td> 4: 36 </Td> </Tr> <Tr> <Td> 3 . </Td> <Td> "How We Operate" (Original by Gomez) </Td> <Td> Ben Ottewell </Td> <Td> Kevin McKidd </Td> <Td> 4: 30 </Td> </Tr> <Tr> <Td> 4 . </Td> <Td> "Wait" (Original by Get Set Go) </Td> <Td> </Td> <Td> Chandra Wilson, Sarah Drew, Chyler Leigh </Td> <Td> 3: 22 </Td> </Tr> <Tr> <Td> 5 . </Td> <Td> "Runnin' on Sunshine" (Original by Jesus Jackson) </Td> <Td> Norman Cook, Roland Clark </Td> <Td> Sara Ramirez, Daniel Sunjata, Kevin McKidd, Scott Foley, Justin Chambers, Chandra Wilson, Jessica Capshaw, Kim Raver, Chyler Leigh, Ellen Pompeo, and Patrick Dempsey </Td> <Td> 4: 05 </Td> </Tr>

Who sings in grey's anatomy musical episode