Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1796/book_of_rights.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5151-book_of_rights.ps) >>/Users/jc/w/tmp/Tune-5151-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1796/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
Coll_51518.log 142805 Log file, useful mostly for debugging
Tune-5151-book_of_rights.abc 151 ABC music file with the extracted tune(s)
Tune-5151-book_of_rights.ps 6 PostScript
Tune-5151-book_of_rights.txt 151 Plain-text file with the extracted tune(s)
Tune-5151-get.log 4146 Log file, useful mostly for debugging
Tune-51510-get.log 1413 Log file, useful mostly for debugging
Tune-51512-get.log 4113 Log file, useful mostly for debugging
Tune-51513-get.log 4101 Log file, useful mostly for debugging
Tune-51514-get.log 1435 Log file, useful mostly for debugging
These files should be available for 24 hours.