Thank you for typing that out cetmst.
I have found Barney Baley in the ALBA biographies:
Barney Baley's ALBA Biography
This biography does not mention that he served with the Canadian Mackenzie Papineau Battalion in the SCW but another source HERE
confirm that he did.
As part of Barney Baley's obituary printed in the Volunteer, 2001
The Volunteer Newsletter, 2001. Barney Baley's Obituary Page 21
there is one of his poem's reproduced called ALBAREZ THANKSGIVING, -1937 which begins
Songs of all lands are medleys here in Spain:
and then names various songs which the Brigaders sang and heard in Spain. Among them is Rich Man of Jerusalem So no doubt, we have the right man.