Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0073_Quick_Step_Turkish.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5603-book0.ps) >>/Users/jc/w/tmp/Tune-5603-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0073_Quick_Step_Turkish.abc/book0

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_5603.log 263256 Log file, useful mostly for debugging
Coll_56032.log 253422 Log file, useful mostly for debugging
Coll_56034.log 268876 Log file, useful mostly for debugging
Form_56030.log 1869 Log file, useful mostly for debugging
Form_56036.log 811 Log file, useful mostly for debugging
Tune-5603-book0.abc 180 ABC music file with the extracted tune(s)
Tune-5603-book0.ps 6 PostScript
Tune-5603-book0.txt 180 Plain-text file with the extracted tune(s)
Tune-5603-get.log 4139 Log file, useful mostly for debugging
Tune-56031-get.log 1451 Log file, useful mostly for debugging
Tune-56034-get.log 4775 Log file, useful mostly for debugging
Tune-56035-get.log 3638 Log file, useful mostly for debugging
These files should be available for 24 hours.