Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/slipjig/24CountryDances_1766.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6420-24CountryDances_1766.ps) >>/Users/jc/w/tmp/Tune-6420-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/slipjig/24CountryDances_1766.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_64203.log 157766 Log file, useful mostly for debugging
Tune-6420-24CountryDances_1766.abc 160 ABC music file with the extracted tune(s)
Tune-6420-24CountryDances_1766.ps 6 PostScript
Tune-6420-24CountryDances_1766.txt 160 Plain-text file with the extracted tune(s)
Tune-6420-get.log 4296 Log file, useful mostly for debugging
Tune-64200-get.log 5855 Log file, useful mostly for debugging
Tune-64201-get.log 5197 Log file, useful mostly for debugging
These files should be available for 24 hours.