Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/C/JohnFrench.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7213-JohnFrench.ps) >>/Users/jc/w/tmp/Tune-7213-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/C/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
Coll_72131.log 278710 Log file, useful mostly for debugging
Coll_72132.log 277305 Log file, useful mostly for debugging
Coll_72133.log 133130 Log file, useful mostly for debugging
Tune-7213-JohnFrench.abc 144 ABC music file with the extracted tune(s)
Tune-7213-JohnFrench.ps 6 PostScript
Tune-7213-JohnFrench.txt 144 Plain-text file with the extracted tune(s)
Tune-7213-get.log 4048 Log file, useful mostly for debugging
Tune-72134-Barsanti_CoOST.abc 151 ABC music file with the extracted tune(s)
Tune-72134-Barsanti_CoOST.txt 151 Plain-text file with the extracted tune(s)
Tune-72134-get.log 3258 Log file, useful mostly for debugging
These files should be available for 24 hours.