All that can presently (May 2013) be gleaned about by internet searching is that Opal A. Allyn is the one-off composer of The Opalescent Rag (n.d.).
Surfers are welcome to contribute information about this composer.
This list is arranged in chronological order and contains 1 work by Opal A. Allyn. It does not claim to be complete and represents only the number of items located. Key: Electronic Resource Items