I'll Be Your Sweetheart

I'll Be Your Sweetheart is a 1945 British historical musical film directed by Val Guest and starring Margaret Lockwood, Vic Oliver and Michael Rennie. It was written by Val Valentine, Guest and Edward Percy, and was the only musical film produced by Gainsborough Studios. Commissioned by the British Ministry of Information, it is set at the beginning of the 20th century, and is about the composers of popular music hall songs fighting for a new copyright law that will protect them from having their songs stolen.