pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5242-CMCIT.ps) >>/Users/jc/w/tmp/Tune-5242-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/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-5242-CMCIT.abc 28578 ABC music file with the extracted tune(s)
Tune-5242-CMCIT.ps 440180 PostScript
Tune-5242-CMCIT.txt 28578 Plain-text file with the extracted tune(s)
Tune-5242-get.log 27684 Log file, useful mostly for debugging
Tune-52421-get.log 5232 Log file, useful mostly for debugging
Tune-52422-get.log 4476 Log file, useful mostly for debugging
Tune-52423-get.log 5050 Log file, useful mostly for debugging
Tune-52424-get.log 5174 Log file, useful mostly for debugging
Tune-52426-get.log 4536 Log file, useful mostly for debugging
Tune-52427-get.log 4358 Log file, useful mostly for debugging
These files should be available for 24 hours.