Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/4NCD/Gow-CSR4-abc2.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5020-Gow-CSR4-abc2.ps) >>/Users/jc/w/tmp/Tune-5020-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/4NCD/Gow-CSR4-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
Coll_50203.log 156512 Log file, useful mostly for debugging
Tune-5020-Gow-CSR4-abc2.abc 150 ABC music file with the extracted tune(s)
Tune-5020-Gow-CSR4-abc2.ps 6 PostScript
Tune-5020-Gow-CSR4-abc2.txt 150 Plain-text file with the extracted tune(s)
Tune-5020-get.log 4127 Log file, useful mostly for debugging
Tune-50201-JamesJohnson_ScotsMusicalMuseumV5-V2.abc 177 ABC music file with the extracted tune(s)
Tune-50201-JamesJohnson_ScotsMusicalMuseumV5-V2.ps 6 PostScript
Tune-50201-JamesJohnson_ScotsMusicalMuseumV5-V2.txt 177 Plain-text file with the extracted tune(s)
Tune-50201-get.log 13456 Log file, useful mostly for debugging
Tune-50202-get.log 3086 Log file, useful mostly for debugging
Tune-50204-get.log 5562 Log file, useful mostly for debugging
Tune-50205-get.log 4492 Log file, useful mostly for debugging
Tune-50206-get.log 8412 Log file, useful mostly for debugging
Tune-50208-get.log 3368 Log file, useful mostly for debugging
These files should be available for 24 hours.