Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0148_Old_Plantation_Girls.abc/book0"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5403-book0.ps) >>/Users/jc/w/tmp/Tune-5403-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/ONeills/Rare_Small/0148_Old_Plantation_Girls.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_5403.log 266066 Log file, useful mostly for debugging
Coll_54030.log 527917 Log file, useful mostly for debugging
Coll_54035.log 260446 Log file, useful mostly for debugging
Tune-5403-book0.abc 182 ABC music file with the extracted tune(s)
Tune-5403-book0.ps 6 PostScript
Tune-5403-book0.txt 182 Plain-text file with the extracted tune(s)
Tune-5403-get.log 9434 Log file, useful mostly for debugging
Tune-54030-get.log 5253 Log file, useful mostly for debugging
Tune-54033-get.log 6596 Log file, useful mostly for debugging
Tune-54038-get.log 5751 Log file, useful mostly for debugging
Tune-54039-get.log 4474 Log file, useful mostly for debugging
These files should be available for 24 hours.