Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/CPC/Gow-CSR3-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-6159-Gow-CSR3-abc2.ps) >>/Users/jc/w/tmp/Tune-6159-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/CPC/Gow-CSR3-abc2.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-6159-Gow-CSR3-abc2.abc 149 ABC music file with the extracted tune(s)
Tune-6159-Gow-CSR3-abc2.ps 6 PostScript
Tune-6159-Gow-CSR3-abc2.txt 149 Plain-text file with the extracted tune(s)
Tune-6159-get.log 4119 Log file, useful mostly for debugging
Tune-61592-get.log 4474 Log file, useful mostly for debugging
Tune-99580-Tune-61593-SCD_RoyGoldring_15SocialDances.abc 193 ABC music file with the extracted tune(s)
Tune-99580-Tune-61593-SCD_RoyGoldring_15SocialDances.txt 193 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.