Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0077_Roast_Beef.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6418-book0.ps) >>/Users/jc/w/tmp/Tune-6418-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0077_Roast_Beef.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
Coll_64184.log 2287221 Log file, useful mostly for debugging
Tune-6418-book0.abc 172 ABC music file with the extracted tune(s)
Tune-6418-book0.ps 6 PostScript
Tune-6418-book0.txt 172 Plain-text file with the extracted tune(s)
Tune-6418-get.log 8311 Log file, useful mostly for debugging
Tune-64185-get.log 5457 Log file, useful mostly for debugging
Tune-64187-get.log 4155 Log file, useful mostly for debugging
Tune-64188-get.log 4196 Log file, useful mostly for debugging
Tune-64189-Windsor_Terrace.abc 458 ABC music file with the extracted tune(s)
Tune-64189-Windsor_Terrace.pdf 14329 Portable Data Format
Tune-64189-Windsor_Terrace.ps 33741 PostScript
Tune-64189-Windsor_Terrace.txt 458 Plain-text file with the extracted tune(s)
Tune-64189-get.log 15957 Log file, useful mostly for debugging
These files should be available for 24 hours.