Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book21/_.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6298-_.ps) >>/Users/jc/w/tmp/Tune-6298-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book21/_.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-6298-_.abc 140 ABC music file with the extracted tune(s)
Tune-6298-_.ps 6 PostScript
Tune-6298-_.txt 140 Plain-text file with the extracted tune(s)
Tune-6298-get.log 3889 Log file, useful mostly for debugging
Tune-62981-Kohlers3.pdf 2217 Portable Data Format
Tune-62981-Kohlers3.txt 145 Plain-text file with the extracted tune(s)
Tune-62981-get.log 4824 Log file, useful mostly for debugging
Tune-62989-get.log 3984 Log file, useful mostly for debugging
These files should be available for 24 hours.