Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/SCAJMR/CMCIT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9089-CMCIT.ps) >>/Users/jc/w/tmp/Tune-9089-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCAJMR/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
Coll_90897.log 831178 Log file, useful mostly for debugging
Tune-9089-CMCIT.abc 144 ABC music file with the extracted tune(s)
Tune-9089-CMCIT.ps 6 PostScript
Tune-9089-CMCIT.txt 144 Plain-text file with the extracted tune(s)
Tune-9089-get.log 3975 Log file, useful mostly for debugging
Tune-90890-get.log 4535 Log file, useful mostly for debugging
Tune-90893-get.log 1287 Log file, useful mostly for debugging
Tune-90894-get.log 5366 Log file, useful mostly for debugging
Tune-90895-WilliamCampbell_10thBook_1798-V1.abc 168 ABC music file with the extracted tune(s)
Tune-90895-WilliamCampbell_10thBook_1798-V1.ps 6 PostScript
Tune-90895-WilliamCampbell_10thBook_1798-V1.txt 168 Plain-text file with the extracted tune(s)
Tune-90895-get.log 4447 Log file, useful mostly for debugging
Tune-90898-get.log 5380 Log file, useful mostly for debugging
Tune-90899-get.log 7443 Log file, useful mostly for debugging
These files should be available for 24 hours.