Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1794/book_of_rights.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-8590-book_of_rights.ps) >>/Users/jc/w/tmp/Tune-8590-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1794/book_of_rights.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-8590-book_of_rights.abc 151 ABC music file with the extracted tune(s)
Tune-8590-book_of_rights.ps 6 PostScript
Tune-8590-book_of_rights.txt 151 Plain-text file with the extracted tune(s)
Tune-8590-get.log 8454 Log file, useful mostly for debugging
Tune-85900-get.log 82267 Log file, useful mostly for debugging
Tune-85901-get.log 9579 Log file, useful mostly for debugging
Tune-85902-get.log 20098 Log file, useful mostly for debugging
Tune-85903-get.log 8993 Log file, useful mostly for debugging
Tune-85904-Tune-60537-0_Title.abc 170 ABC music file with the extracted tune(s)
Tune-85904-Tune-60537-0_Title.txt 170 Plain-text file with the extracted tune(s)
Tune-85904-get.log 11407 Log file, useful mostly for debugging
Tune-85906-get.log 4654 Log file, useful mostly for debugging
Tune-85907-get.log 8909 Log file, useful mostly for debugging
Tune-85908-get.log 5630 Log file, useful mostly for debugging
These files should be available for 24 hours.