Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/CCCCD/CJSurtees.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4824-CJSurtees.ps) >>/Users/jc/w/tmp/Tune-4824-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CCCCD/CJSurtees.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_48248.log 1130180 Log file, useful mostly for debugging
Tune-4824-CJSurtees.abc 147 ABC music file with the extracted tune(s)
Tune-4824-CJSurtees.ps 6 PostScript
Tune-4824-CJSurtees.txt 147 Plain-text file with the extracted tune(s)
Tune-4824-get.log 4053 Log file, useful mostly for debugging
Tune-48240-Stewart_SCAJMR_1784-V2.abc 161 ABC music file with the extracted tune(s)
Tune-48240-Stewart_SCAJMR_1784-V2.txt 161 Plain-text file with the extracted tune(s)
Tune-48240-get.log 3410 Log file, useful mostly for debugging
Tune-48244-get.log 1396 Log file, useful mostly for debugging
Tune-48247-get.log 5778 Log file, useful mostly for debugging
Tune-48248-get.log 5788 Log file, useful mostly for debugging
These files should be available for 24 hours.