Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0079_Allemande.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6110-book0.ps) >>/Users/jc/w/tmp/Tune-6110-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0079_Allemande.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_61104.log 264661 Log file, useful mostly for debugging
Coll_61105.log 374251 Log file, useful mostly for debugging
Coll_61107.log 266066 Log file, useful mostly for debugging
Coll_61108.log 264661 Log file, useful mostly for debugging
Form_61103.log 1004 Log file, useful mostly for debugging
List61100.log 160 Log file, useful mostly for debugging
Tune-6110-book0.abc 171 ABC music file with the extracted tune(s)
Tune-6110-book0.ps 6 PostScript
Tune-6110-book0.txt 171 Plain-text file with the extracted tune(s)
Tune-6110-get.log 8386 Log file, useful mostly for debugging
Tune-61101-get.log 5556 Log file, useful mostly for debugging
Tune-61107-get.log 4634 Log file, useful mostly for debugging
These files should be available for 24 hours.