Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book44/JohnFrench.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-64660-JohnFrench.ps) >>/Users/jc/w/tmp/Tune-64660-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book44/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-64660-20142_Sprig_of_Shillelah.abc 558 ABC music file with the extracted tune(s)
Tune-64660-20142_Sprig_of_Shillelah.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-64660-20142_Sprig_of_Shillelah.ps 35424 PostScript
Tune-64660-20142_Sprig_of_Shillelah.txt 558 Plain-text file with the extracted tune(s)
Tune-64660-JohnFrench.abc 149 ABC music file with the extracted tune(s)
Tune-64660-JohnFrench.ps 6 PostScript
Tune-64660-JohnFrench.txt 149 Plain-text file with the extracted tune(s)
Tune-64660-get.log 9657 Log file, useful mostly for debugging
These files should be available for 24 hours.