Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1759/Gow-CR-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-37795-Gow-CR-abc1.ps) >>/Users/jc/w/tmp/Tune-37795-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1759/Gow-CR-abc1.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-37795-015_Millicents_Favorite.abc 932 ABC music file with the extracted tune(s)
Tune-37795-015_Millicents_Favorite.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-37795-015_Millicents_Favorite.ps 40545 PostScript
Tune-37795-015_Millicents_Favorite.txt 932 Plain-text file with the extracted tune(s)
Tune-37795-Gow-CR-abc1.abc 148 ABC music file with the extracted tune(s)
Tune-37795-Gow-CR-abc1.ps 6 PostScript
Tune-37795-Gow-CR-abc1.txt 148 Plain-text file with the extracted tune(s)
Tune-37795-get.log 9786 Log file, useful mostly for debugging
These files should be available for 24 hours.