William Hyder 
Last updated: 22.06.17
All that can presently (May 2013) be gleaned about by internet searching is that William Hyder is the one-off composer of Polyphonic Rag (1979).
Surfers are welcome to contribute information about this composer.
CDs :
Ragtime Music CDs:
cd15.gif Sue Keller on "Ol' Muddy" CD(s) & MP3 Album(s) flag15us.gif flag15de.gif