Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1800/CMCIT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8566-CMCIT.ps) >>/Users/jc/w/tmp/Tune-8566-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1800/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-8566-CMCIT.abc 142 ABC music file with the extracted tune(s)
Tune-8566-CMCIT.ps 6 PostScript
Tune-8566-CMCIT.txt 142 Plain-text file with the extracted tune(s)
Tune-8566-get.log 3961 Log file, useful mostly for debugging
Tune-85660-get.log 1517 Log file, useful mostly for debugging
Tune-85663-get.log 2815 Log file, useful mostly for debugging
Tune-85666-20481_Jockey_to_the_Fair.abc 701 ABC music file with the extracted tune(s)
Tune-85666-20481_Jockey_to_the_Fair.pdf 17352 Portable Data Format
Tune-85666-20481_Jockey_to_the_Fair.ps 36275 PostScript
Tune-85666-20481_Jockey_to_the_Fair.txt 701 Plain-text file with the extracted tune(s)
Tune-85666-get.log 5665 Log file, useful mostly for debugging
Tune-85667-get.log 9658 Log file, useful mostly for debugging
These files should be available for 24 hours.