pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-79977-SmithyHill.ps) >>/Users/jc/w/tmp/Tune-79977-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/England/SmithyHill.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_79977.log 281520 Log file, useful mostly for debugging
Tune-79977-SmithyHill.abc 879 ABC music file with the extracted tune(s)
Tune-79977-SmithyHill.ps 38491 PostScript
Tune-79977-SmithyHill.txt 879 Plain-text file with the extracted tune(s)
Tune-79977-get.log 4813 Log file, useful mostly for debugging
These files should be available for 24 hours.