Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1810/MMM1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7469-MMM1.ps) >>/Users/jc/w/tmp/Tune-7469-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1810/MMM1.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Form_74698.log 803 Log file, useful mostly for debugging
Tune-7469-MMM1.abc 141 ABC music file with the extracted tune(s)
Tune-7469-MMM1.ps 6 PostScript
Tune-7469-MMM1.txt 141 Plain-text file with the extracted tune(s)
Tune-7469-get.log 3936 Log file, useful mostly for debugging
Tune-74691-get.log 1363 Log file, useful mostly for debugging
Tune-74695-get.log 32082 Log file, useful mostly for debugging
Tune-74699-JackPudding-001.svg 11356 Scalable Vector Graphics format
Tune-74699-JackPudding.abc 242 ABC music file with the extracted tune(s)
Tune-74699-JackPudding.txt 242 Plain-text file with the extracted tune(s)
Tune-74699-get.log 4057 Log file, useful mostly for debugging
These files should be available for 24 hours.