Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/1792/blank.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5527-blank.ps) >>/Users/jc/w/tmp/Tune-5527-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/1792/blank.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_55279.log 157117 Log file, useful mostly for debugging
Tune-5527-blank.abc 142 ABC music file with the extracted tune(s)
Tune-5527-blank.ps 6 PostScript
Tune-5527-blank.txt 142 Plain-text file with the extracted tune(s)
Tune-5527-get.log 3959 Log file, useful mostly for debugging
Tune-55270-get.log 10504 Log file, useful mostly for debugging
Tune-55271-get.log 9620 Log file, useful mostly for debugging
Tune-55272-get.log 5433 Log file, useful mostly for debugging
Tune-55274-get.log 1376 Log file, useful mostly for debugging
Tune-55277-get.log 8511 Log file, useful mostly for debugging
Tune-55278-24CountryDances_1803_Preston.abc 165 ABC music file with the extracted tune(s)
Tune-55278-24CountryDances_1803_Preston.ps 6 PostScript
Tune-55278-24CountryDances_1803_Preston.txt 165 Plain-text file with the extracted tune(s)
Tune-55278-get.log 8842 Log file, useful mostly for debugging
These files should be available for 24 hours.