Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0054_Cottillon.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1182-book0.ps) >>/Users/jc/w/tmp/Tune-1182-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0054_Cottillon.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_1182.log 418891 Log file, useful mostly for debugging
Coll_11822.log 249206 Log file, useful mostly for debugging
Coll_11823.log 261851 Log file, useful mostly for debugging
Coll_11825.log 268876 Log file, useful mostly for debugging
Coll_11827.log 527917 Log file, useful mostly for debugging
Coll_11829.log 264661 Log file, useful mostly for debugging
Form_11824.log 838 Log file, useful mostly for debugging
Tune-1182-book0.abc 171 ABC music file with the extracted tune(s)
Tune-1182-book0.ps 6 PostScript
Tune-1182-book0.txt 171 Plain-text file with the extracted tune(s)
Tune-1182-get.log 4085 Log file, useful mostly for debugging
Tune-11820-get.log 8332 Log file, useful mostly for debugging
Tune-11824-get.log 10617 Log file, useful mostly for debugging
Tune-11826-get.log 5838 Log file, useful mostly for debugging
These files should be available for 24 hours.