Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book45/MMM2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8974-MMM2.ps) >>/Users/jc/w/tmp/Tune-8974-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book45/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
Form_89745.log 924 Log file, useful mostly for debugging
Tune-8974-MMM2.abc 143 ABC music file with the extracted tune(s)
Tune-8974-MMM2.ps 6 PostScript
Tune-8974-MMM2.txt 143 Plain-text file with the extracted tune(s)
Tune-8974-get.log 8325 Log file, useful mostly for debugging
Tune-89740-Nelson.abc 162 ABC music file with the extracted tune(s)
Tune-89740-Nelson.ps 6 PostScript
Tune-89740-Nelson.txt 162 Plain-text file with the extracted tune(s)
Tune-89740-get.log 13813 Log file, useful mostly for debugging
Tune-89741-CSRHW-abc1.abc 149 ABC music file with the extracted tune(s)
Tune-89741-CSRHW-abc1.ps 6 PostScript
Tune-89741-CSRHW-abc1.txt 149 Plain-text file with the extracted tune(s)
Tune-89741-get.log 5454 Log file, useful mostly for debugging
Tune-89744-get.log 5787 Log file, useful mostly for debugging
Tune-89745-get.log 4537 Log file, useful mostly for debugging
Tune-89746-get.log 3204 Log file, useful mostly for debugging
Tune-89747-get.log 5543 Log file, useful mostly for debugging
These files should be available for 24 hours.