Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ScotsMusicalMuseumV4/dance.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5009-dance.ps) >>/Users/jc/w/tmp/Tune-5009-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ScotsMusicalMuseumV4/dance.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_50091.abc 554 ABC music file with the extracted tune(s)
Form_50091.log 1043 Log file, useful mostly for debugging
Form_50091_001.svg 26460 Scalable Vector Graphics format
Tune-5009-dance.abc 158 ABC music file with the extracted tune(s)
Tune-5009-dance.ps 6 PostScript
Tune-5009-dance.txt 158 Plain-text file with the extracted tune(s)
Tune-5009-get.log 4055 Log file, useful mostly for debugging
Tune-50096-get.log 5400 Log file, useful mostly for debugging
Tune-50097-get.log 34276 Log file, useful mostly for debugging
These files should be available for 24 hours.