pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2017-RowWellYeMariners.ps) >>/Users/jc/w/tmp/Tune-2017-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/England/RowWellYeMariners.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_20172.log 289950 Log file, useful mostly for debugging
Coll_20176.log 282926 Log file, useful mostly for debugging
Tune-2017-RowWellYeMariners.abc 1130 ABC music file with the extracted tune(s)
Tune-2017-RowWellYeMariners.ps 40162 PostScript
Tune-2017-RowWellYeMariners.txt 1130 Plain-text file with the extracted tune(s)
Tune-2017-get.log 5568 Log file, useful mostly for debugging
These files should be available for 24 hours.