Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1802/Barsanti_CoOST.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8959-Barsanti_CoOST.ps) >>/Users/jc/w/tmp/Tune-8959-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1802/Barsanti_CoOST.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_89593.log 263809 Log file, useful mostly for debugging
Tune-8959-Barsanti_CoOST.abc 151 ABC music file with the extracted tune(s)
Tune-8959-Barsanti_CoOST.ps 6 PostScript
Tune-8959-Barsanti_CoOST.txt 151 Plain-text file with the extracted tune(s)
Tune-8959-get.log 4146 Log file, useful mostly for debugging
Tune-89590-get.log 7042 Log file, useful mostly for debugging
Tune-89592-get.log 4145 Log file, useful mostly for debugging
Tune-89593-get.log 4767 Log file, useful mostly for debugging
Tune-89596-get.log 13408 Log file, useful mostly for debugging
Tune-89597-get.log 4224 Log file, useful mostly for debugging
Tune-89598-get.log 9955 Log file, useful mostly for debugging
Tune-89599-get.log 5203 Log file, useful mostly for debugging
These files should be available for 24 hours.