Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/tune/CMCIT.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3594-CMCIT.ps) >>/Users/jc/w/tmp/Tune-3594-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/tune/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_3594.log 286208 Log file, useful mostly for debugging
Coll_35941.log 349931 Log file, useful mostly for debugging
Tune-3594-CMCIT.abc 142 ABC music file with the extracted tune(s)
Tune-3594-CMCIT.ps 6 PostScript
Tune-3594-CMCIT.txt 142 Plain-text file with the extracted tune(s)
Tune-3594-get.log 3963 Log file, useful mostly for debugging
Tune-35942-get.log 1356 Log file, useful mostly for debugging
Tune-35944-24CountryDances_1774_Thompson.abc 166 ABC music file with the extracted tune(s)
Tune-35944-24CountryDances_1774_Thompson.txt 166 Plain-text file with the extracted tune(s)
Tune-35944-get.log 3528 Log file, useful mostly for debugging
Tune-35947-get.log 1309 Log file, useful mostly for debugging
These files should be available for 24 hours.