Thank You Freda The Phd Thesis looks as if it will be very interesting.

The first song by O'Sincerity is not one I have encountered before and if anyone knows the traditional Industrial Workers of the World song it is based on I would like to know.
I am not sure that 'Salute to a Comrade',the second, was actually a song rather than a poem but I would be pleased to be wrong if anyone knows for sure.

The third song,'Song of the International Brigades'is as the author says , a well known song but I think he was a bit misleading in saying it was composed by Jack Franklyn and Joe Frankel: I think they may have translated it from German because I think it was written by Erich Weinert (but again I am not sure)Here is a YouTube Link to Song of the International Brigades sung by Ernst Busch and on this site are the german Lyrics attributed to Weinert
Original ? German lyrics , Erich Weinert,

Your link to the interview is very interesting and it is a pity it would be so hard for me to get hold of but the song list given is very interesting. Most of the songs are ones which the German singer Ernst Busch recorded in Spain with a few, probably Russian, songs. The songs called Morning Comes Early,and Walking at Night. are completely new to me, Does anyone else recognise them - did they come out of Spain/

Thanks again Freda,: great detective work.