Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/misc/SocialDances2002.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9971-SocialDances2002.ps) >>/Users/jc/w/tmp/Tune-9971-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/misc/SocialDances2002.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_99714.log 833 Log file, useful mostly for debugging
Tune-9971-SocialDances2002.abc 153 ABC music file with the extracted tune(s)
Tune-9971-SocialDances2002.ps 6 PostScript
Tune-9971-SocialDances2002.txt 153 Plain-text file with the extracted tune(s)
Tune-9971-get.log 4190 Log file, useful mostly for debugging
Tune-99714-get.log 3313 Log file, useful mostly for debugging
Tune-99717-get.log 1392 Log file, useful mostly for debugging
These files should be available for 24 hours.