Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0000_Title.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6689-book0.ps) >>/Users/jc/w/tmp/Tune-6689-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0000_Title.abc/book0

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.65 512x512 PNG]
filesizedescription
Tune-6689-book0.abc 167 ABC music file with the extracted tune(s)
Tune-6689-book0.ps 6 PostScript
Tune-6689-book0.txt 167 Plain-text file with the extracted tune(s)
Tune-6689-get.log 4067 Log file, useful mostly for debugging
Tune-66890-get.log 4939 Log file, useful mostly for debugging
Tune-66891-get.log 5694 Log file, useful mostly for debugging
Tune-66892-get.log 10601 Log file, useful mostly for debugging
Tune-66895-get.log 4539 Log file, useful mostly for debugging
Tune-66896-JohnJohnson_ChoiceCollectionVol8-VMP.abc 174 ABC music file with the extracted tune(s)
Tune-66896-JohnJohnson_ChoiceCollectionVol8-VMP.pdf 2217 Portable Data Format
Tune-66896-JohnJohnson_ChoiceCollectionVol8-VMP.ps 6 PostScript
Tune-66896-JohnJohnson_ChoiceCollectionVol8-VMP.txt 174 Plain-text file with the extracted tune(s)
Tune-66896-get.log 5644 Log file, useful mostly for debugging
Tune-66898-get.log 4025 Log file, useful mostly for debugging
Tune-66899-get.log 5515 Log file, useful mostly for debugging
These files should be available for 24 hours.