Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1770/CMCIT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4496-CMCIT.ps) >>/Users/jc/w/tmp/Tune-4496-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1770/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_44967.log 282011 Log file, useful mostly for debugging
Tune-4496-CMCIT.abc 142 ABC music file with the extracted tune(s)
Tune-4496-CMCIT.ps 6 PostScript
Tune-4496-CMCIT.txt 142 Plain-text file with the extracted tune(s)
Tune-4496-get.log 3959 Log file, useful mostly for debugging
Tune-44961-get.log 9762 Log file, useful mostly for debugging
Tune-44962-get.log 14461 Log file, useful mostly for debugging
Tune-44963-TwoAndSixpennyGirlTheJig.abc 420 ABC music file with the extracted tune(s)
Tune-44963-TwoAndSixpennyGirlTheJig.ps 34487 PostScript
Tune-44963-TwoAndSixpennyGirlTheJig.txt 420 Plain-text file with the extracted tune(s)
Tune-44963-get.log 4917 Log file, useful mostly for debugging
Tune-44964-get.log 9837 Log file, useful mostly for debugging
Tune-44965-get.log 10023 Log file, useful mostly for debugging
Tune-44968-get.log 7908 Log file, useful mostly for debugging
Tune-44969-get.log 3512 Log file, useful mostly for debugging
These files should be available for 24 hours.