Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/MMM1/MMM1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-3330-MMM1.ps) >>/Users/jc/w/tmp/Tune-3330-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/MMM1/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
Sess-33304.log 16373 Log file, useful mostly for debugging
Tune-3330-MMM1.abc 141 ABC music file with the extracted tune(s)
Tune-3330-MMM1.ps 6 PostScript
Tune-3330-MMM1.txt 141 Plain-text file with the extracted tune(s)
Tune-3330-get.log 3940 Log file, useful mostly for debugging
Tune-33302-get.log 30237 Log file, useful mostly for debugging
Tune-33304-get.log 5581 Log file, useful mostly for debugging
Tune-33309-get.log 1422 Log file, useful mostly for debugging
These files should be available for 24 hours.