pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-94156-ScotchMary.ps) >>/Users/jc/w/tmp/Tune-94156-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/Contra/ScotchMary.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_94156.log 821 Log file, useful mostly for debugging
Tune-94156-ScotchMary.abc 1624 ABC music file with the extracted tune(s)
Tune-94156-ScotchMary.ps 51189 PostScript
Tune-94156-ScotchMary.txt 1624 Plain-text file with the extracted tune(s)
Tune-94156-get.log 5771 Log file, useful mostly for debugging
These files should be available for 24 hours.