Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book14/MMM2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5900-MMM2.ps) >>/Users/jc/w/tmp/Tune-5900-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book14/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
Coll_59003.log 234895 Log file, useful mostly for debugging
Tune-5900-MMM2.abc 143 ABC music file with the extracted tune(s)
Tune-5900-MMM2.ps 6 PostScript
Tune-5900-MMM2.txt 143 Plain-text file with the extracted tune(s)
Tune-5900-get.log 3954 Log file, useful mostly for debugging
Tune-59002-get.log 3558 Log file, useful mostly for debugging
Tune-59009-ThomasBraysCountryDances1699.abc 168 ABC music file with the extracted tune(s)
Tune-59009-ThomasBraysCountryDances1699.ps 6 PostScript
Tune-59009-ThomasBraysCountryDances1699.txt 168 Plain-text file with the extracted tune(s)
Tune-59009-get.log 4510 Log file, useful mostly for debugging
These files should be available for 24 hours.