Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/jpg/Thompson_V4_1773-1780_PD.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9223-Thompson_V4_1773-1780_PD.ps) >>/Users/jc/w/tmp/Tune-9223-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/jpg/Thompson_V4_1773-1780_PD.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-9223-Thompson_V4_1773-1780_PD.abc 160 ABC music file with the extracted tune(s)
Tune-9223-Thompson_V4_1773-1780_PD.ps 6 PostScript
Tune-9223-Thompson_V4_1773-1780_PD.txt 160 Plain-text file with the extracted tune(s)
Tune-9223-get.log 4352 Log file, useful mostly for debugging
Tune-92230-get.log 12904 Log file, useful mostly for debugging
Tune-92231-get.log 4800 Log file, useful mostly for debugging
Tune-92232-get.log 6914 Log file, useful mostly for debugging
Tune-92234-get.log 5717 Log file, useful mostly for debugging
Tune-92235-get.log 8956 Log file, useful mostly for debugging
Tune-92239-get.log 4382 Log file, useful mostly for debugging
These files should be available for 24 hours.