William Schroeder 
Last updated: 10.04.18
All that can presently (February 2016) be gleaned about by internet searching is that William Schroeder is the one-off composer of Rig-a-Jig Rag (1917) published by M. Witmark and Sons, New York, Chicago, San Francisco, USA.
Surfers are welcome to contribute information about this composer.
This list is arranged in chronological order and contains 2 works by William Schroeder. It does not claim to be complete and represents only the number of items located.

Pompon (1913) wvicon.gif
Rig-a-Jig Rag (1917) wvicon.gif