Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/AdvancedSD/BonAccordCollection.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4818-BonAccordCollection.ps) >>/Users/jc/w/tmp/Tune-4818-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/AdvancedSD/BonAccordCollection.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_48187.log 315240 Log file, useful mostly for debugging
Tune-4818-BonAccordCollection.abc 162 ABC music file with the extracted tune(s)
Tune-4818-BonAccordCollection.ps 6 PostScript
Tune-4818-BonAccordCollection.txt 162 Plain-text file with the extracted tune(s)
Tune-4818-get.log 4289 Log file, useful mostly for debugging
Tune-48181-get.log 4457 Log file, useful mostly for debugging
Tune-48183-get.log 6696 Log file, useful mostly for debugging
Tune-48188-get.log 3328 Log file, useful mostly for debugging
These files should be available for 24 hours.