Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/GM/Tom_Jones.abc/1750"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-65435-1750.ps) >>/Users/jc/w/tmp/Tune-65435-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/GM/Tom_Jones.abc/1750

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_65435.log 950 Log file, useful mostly for debugging
Tune-65435-060_Lothians.abc 675 ABC music file with the extracted tune(s)
Tune-65435-060_Lothians.gif 0 Graphics Interchange Format, the proprietary scan-line picture format
Tune-65435-060_Lothians.ps 36507 PostScript
Tune-65435-060_Lothians.txt 675 Plain-text file with the extracted tune(s)
Tune-65435-1750.abc 149 ABC music file with the extracted tune(s)
Tune-65435-1750.ps 6 PostScript
Tune-65435-1750.txt 149 Plain-text file with the extracted tune(s)
Tune-65435-get.log 9343 Log file, useful mostly for debugging
These files should be available for 24 hours.