All that can presently (June 2020) be gleaned about Harry Roy from sheet music covers and by internet searching is that he has 2 ragtime works published between 1934 and 1949.
Surfers are welcome to contribute information about this composer.
This list is arranged by composer and contains 2 songs sung by Harry Roy who is featured on sheet music covers.
It does not claim to be complete and represents only the number of items located. Keys:(w&m)ER