Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/3D2006/MMM2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5372-MMM2.ps) >>/Users/jc/w/tmp/Tune-5372-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/3D2006/MMM2.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-5372-MMM2.abc 143 ABC music file with the extracted tune(s)
Tune-5372-MMM2.ps 6 PostScript
Tune-5372-MMM2.txt 143 Plain-text file with the extracted tune(s)
Tune-5372-get.log 3952 Log file, useful mostly for debugging
Tune-53721-get.log 4553 Log file, useful mostly for debugging
Tune-53723-get.log 16627 Log file, useful mostly for debugging
Tune-53724-get.log 1691 Log file, useful mostly for debugging
Tune-53725-get.log 1394 Log file, useful mostly for debugging
Tune-53726-get.log 7549 Log file, useful mostly for debugging
Tune-53728-Maid_at_the_Well_724-G-32-4-001.svg 16674 Scalable Vector Graphics format
Tune-53728-Maid_at_the_Well_724-G-32-4.abc 456 ABC music file with the extracted tune(s)
Tune-53728-Maid_at_the_Well_724-G-32-4.txt 456 Plain-text file with the extracted tune(s)
Tune-53728-get.log 4524 Log file, useful mostly for debugging
Tune-53729-get.log 27799 Log file, useful mostly for debugging
These files should be available for 24 hours.