Can you fill out the information more? What do either or both of the initials "A. M" stand for? Do you have any song titles or fragments of lyrics? Any idea of the publishers involved? Was this a British songwriter in the UK, or from somewhere else?

I have been known to slip behind the university library paywall to do research, but a few more clues would help.

How is it that you are aware of this individual? What other tidbits can you offer?

My first through passes through Google Advanced search and Google Scholar have yielded nothing (there is a sociologist type by the name of Booth who takes up most of that bandwidth when using date constraints.)