Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Pioneer/JohnFrench.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6837-JohnFrench.ps) >>/Users/jc/w/tmp/Tune-6837-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Pioneer/JohnFrench.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-6837-JohnFrench.abc 150 ABC music file with the extracted tune(s)
Tune-6837-JohnFrench.ps 6 PostScript
Tune-6837-JohnFrench.txt 150 Plain-text file with the extracted tune(s)
Tune-6837-get.log 8163 Log file, useful mostly for debugging
Tune-68370-get.log 5085 Log file, useful mostly for debugging
Tune-68373-cont.abc 141 ABC music file with the extracted tune(s)
Tune-68373-cont.ps 6 PostScript
Tune-68373-cont.txt 141 Plain-text file with the extracted tune(s)
Tune-68373-get.log 3865 Log file, useful mostly for debugging
Tune-68374-SCD_RoyGoldring_15SocialDances.abc 167 ABC music file with the extracted tune(s)
Tune-68374-SCD_RoyGoldring_15SocialDances.ps 6 PostScript
Tune-68374-SCD_RoyGoldring_15SocialDances.txt 167 Plain-text file with the extracted tune(s)
Tune-68374-get.log 4532 Log file, useful mostly for debugging
Tune-68376-get.log 1383 Log file, useful mostly for debugging
Tune-68378-get.log 1352 Log file, useful mostly for debugging
These files should be available for 24 hours.