Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/abc/Scotland/program/20190201/MarquisOfLorne.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8692-MarquisOfLorne.ps) >>/Users/jc/w/tmp/Tune-8692-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Scotland/program/20190201/MarquisOfLorne.abc

Error exit status 256; here are some files to check:

[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Form_86922.log 748 Log file, useful mostly for debugging
Form_86926.log 779 Log file, useful mostly for debugging
Form_86927.log 728 Log file, useful mostly for debugging
Tune-8692-MarquisOfLorne.abc 300 ABC music file with the extracted tune(s)
Tune-8692-MarquisOfLorne.ps 6 PostScript
Tune-8692-MarquisOfLorne.txt 300 Plain-text file with the extracted tune(s)
Tune-8692-get.log 14616 Log file, useful mostly for debugging
Tune-86920-WO.abc 0 ABC music file with the extracted tune(s)
Tune-86920-WO.txt 0 Plain-text file with the extracted tune(s)
Tune-86920-get.log 6449 Log file, useful mostly for debugging
Tune-86921-get.log 4276 Log file, useful mostly for debugging
Tune-86923-get.log 1560 Log file, useful mostly for debugging
Tune-86924-get.log 3892 Log file, useful mostly for debugging
Tune-86929-5574.abc 389 ABC music file with the extracted tune(s)
Tune-86929-5574.txt 389 Plain-text file with the extracted tune(s)
Tune-86929-get.log 2756 Log file, useful mostly for debugging
These files should be available for 24 hours.