Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1805/_.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5704-_.ps) >>/Users/jc/w/tmp/Tune-5704-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1805/_.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_5704.log 695708 Log file, useful mostly for debugging
Coll_57041.log 282011 Log file, useful mostly for debugging
Find_57044.log 1623 Log file, useful mostly for debugging
Tune-5704-_.abc 138 ABC music file with the extracted tune(s)
Tune-5704-_.ps 6 PostScript
Tune-5704-_.txt 138 Plain-text file with the extracted tune(s)
Tune-5704-get.log 3875 Log file, useful mostly for debugging
These files should be available for 24 hours.