Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Tweed2/Gow-CSR2-abc1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4489-Gow-CSR2-abc1.ps) >>/Users/jc/w/tmp/Tune-4489-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Tweed2/Gow-CSR2-abc1.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_44893.log 564446 Log file, useful mostly for debugging
Tune-4489-Gow-CSR2-abc1.abc 152 ABC music file with the extracted tune(s)
Tune-4489-Gow-CSR2-abc1.ps 6 PostScript
Tune-4489-Gow-CSR2-abc1.txt 152 Plain-text file with the extracted tune(s)
Tune-4489-get.log 4135 Log file, useful mostly for debugging
Tune-44890-get.log 4653 Log file, useful mostly for debugging
Tune-44895-flowers_of_Edinburgh.abc 161 ABC music file with the extracted tune(s)
Tune-44895-flowers_of_Edinburgh.txt 161 Plain-text file with the extracted tune(s)
Tune-44895-get.log 7334 Log file, useful mostly for debugging
These files should be available for 24 hours.