Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/X/MoF.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8084-MoF.ps) >>/Users/jc/w/tmp/Tune-8084-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/X/MoF.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-8084-MoF.abc 137 ABC music file with the extracted tune(s)
Tune-8084-MoF.ps 6 PostScript
Tune-8084-MoF.txt 137 Plain-text file with the extracted tune(s)
Tune-8084-get.log 3903 Log file, useful mostly for debugging
Tune-80840-get.log 1418 Log file, useful mostly for debugging
Tune-80844-CSRHW-abc2.abc 158 ABC music file with the extracted tune(s)
Tune-80844-CSRHW-abc2.pdf 2217 Portable Data Format
Tune-80844-CSRHW-abc2.ps 6 PostScript
Tune-80844-CSRHW-abc2.txt 158 Plain-text file with the extracted tune(s)
Tune-80844-get.log 4950 Log file, useful mostly for debugging
Tune-80845-get.log 1418 Log file, useful mostly for debugging
Tune-80847-ThomasMarsden.abc 166 ABC music file with the extracted tune(s)
Tune-80847-ThomasMarsden.ps 6 PostScript
Tune-80847-ThomasMarsden.txt 166 Plain-text file with the extracted tune(s)
Tune-80847-get.log 4269 Log file, useful mostly for debugging
Tune-80849-get.log 1418 Log file, useful mostly for debugging
These files should be available for 24 hours.