Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/William_Thomas_Green/tune.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-75388-tune.ps) >>/Users/jc/w/tmp/Tune-75388-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/William_Thomas_Green/tune.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_75388.log 152582 Log file, useful mostly for debugging
Tune-75388-get.log 4051 Log file, useful mostly for debugging
Tune-75388-tune.abc 157 ABC music file with the extracted tune(s)
Tune-75388-tune.ps 6 PostScript
Tune-75388-tune.txt 157 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.