<P> As noted above , the majority of the songs were pre-recorded by the cast . Music producer Mike Higham , who had previously worked with Sondheim on Sweeney Todd : The Demon Barber of Fleet Street , recorded the film 's score with the London Symphony Orchestra and London Philharmonic . Music supervisor and conductor Paul Gemignani instructed the actors on how to sing , including singing live to a camera on set , to prerecorded music in studio , and with a live studio orchestra . Jonathan Tunick orchestrated Sondheim 's original music . The key to the song , `` Hello , Little Girl , '' was altered to better suit Johnny Depp 's lower vocal range . In regards to the song 's musical arrangement , Higham explained , `` we emphasized the woodwinds to make it feel a little lighter , especially the flutes . And we just made it a little jazzier -- played more on the walking bass line . Inherently , when it has a jazz feel , it just feels lighter . '' The film 's soundtrack was released by Walt Disney Records on December 15 , 2014 . </P>
who did the singing in into the woods
the cast