Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/1826/LondonMagazine.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-5781-LondonMagazine.ps) >>/Users/jc/w/tmp/Tune-5781-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/1826/LondonMagazine.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_57812.log 151853 Log file, useful mostly for debugging
Tune-5781-LondonMagazine.abc 151 ABC music file with the extracted tune(s)
Tune-5781-LondonMagazine.ps 6 PostScript
Tune-5781-LondonMagazine.txt 151 Plain-text file with the extracted tune(s)
Tune-5781-get.log 4144 Log file, useful mostly for debugging
Tune-57811-get.log 4156 Log file, useful mostly for debugging
Tune-57815-get.log 77379 Log file, useful mostly for debugging
Tune-57819-get.log 1406 Log file, useful mostly for debugging
These files should be available for 24 hours.