Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1796/Stewart_SCAJMR_1784-V1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4566-Stewart_SCAJMR_1784-V1.ps) >>/Users/jc/w/tmp/Tune-4566-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1796/Stewart_SCAJMR_1784-V1.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-4566-Stewart_SCAJMR_1784-V1.abc 159 ABC music file with the extracted tune(s)
Tune-4566-Stewart_SCAJMR_1784-V1.ps 6 PostScript
Tune-4566-Stewart_SCAJMR_1784-V1.txt 159 Plain-text file with the extracted tune(s)
Tune-4566-get.log 7970 Log file, useful mostly for debugging
Tune-45660-get.log 3150 Log file, useful mostly for debugging
Tune-45662-get.log 10035 Log file, useful mostly for debugging
Tune-45664-get.log 13913 Log file, useful mostly for debugging
Tune-45665-get.log 10147 Log file, useful mostly for debugging
Tune-45666-get.log 3122 Log file, useful mostly for debugging
Tune-45667-get.log 8834 Log file, useful mostly for debugging
These files should be available for 24 hours.