The original title of this movie was called The Hard Way.
As the session log and Daily Music Report (below) clearly shows, the running title of this movie at this time was Treat Me Nice instead of Jailhouse Rock. The title of the movie was changed to Jailhouse Rock by May 7 1957.
It appears that all session tapes recorded by MGM at their Sound Stage, were discarded once the masters were chosen, and the only session tapes existing today are the tapes recorded by Thorne Nogar at Radio Recorders.
An often repeated story of how Elvis left the studio after lunch on this date, after management told The Jordanaires to stop singing spirituals with Elvis, as it was holding up the planned sessions, has been found to be false.
A recently discovered recording log from this day reveals that Elvis at least attempted to record 'I Want To Be Free' (2007) in the afternoon, recording four takes before giving up, after only rehearsing in the morning.
The demo of 'Young Hearts' was also played to Elvis and the band before the session finished at 4:00pm. Although originally intended to be recorded at some point during these sessions, 'Young Hearts' was eventually not used at all in the movie.
All timings in the 'Musical Breakdown' below are taken from the DVD release of the movie.
Thanks to David English for extensive research on these sessions.