Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1793/CMCIT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5710-CMCIT.ps) >>/Users/jc/w/tmp/Tune-5710-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1793/CMCIT.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-5710-CMCIT.abc 142 ABC music file with the extracted tune(s)
Tune-5710-CMCIT.ps 6 PostScript
Tune-5710-CMCIT.txt 142 Plain-text file with the extracted tune(s)
Tune-5710-get.log 12863 Log file, useful mostly for debugging
Tune-57101-get.log 1424 Log file, useful mostly for debugging
Tune-57103-get.log 5614 Log file, useful mostly for debugging
Tune-57107-get.log 1343 Log file, useful mostly for debugging
Tune-57108-ViolaRuth_AmericanSD.abc 157 ABC music file with the extracted tune(s)
Tune-57108-ViolaRuth_AmericanSD.ps 6 PostScript
Tune-57108-ViolaRuth_AmericanSD.txt 157 Plain-text file with the extracted tune(s)
Tune-57108-get.log 4203 Log file, useful mostly for debugging
These files should be available for 24 hours.