Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/_/Remick.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4524-Remick.ps) >>/Users/jc/w/tmp/Tune-4524-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/_/Remick.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_45243.log 274495 Log file, useful mostly for debugging
Coll_45247.log 1337270 Log file, useful mostly for debugging
Coll_45248.log 266067 Log file, useful mostly for debugging
Tune-4524-Remick.abc 140 ABC music file with the extracted tune(s)
Tune-4524-Remick.ps 6 PostScript
Tune-4524-Remick.txt 140 Plain-text file with the extracted tune(s)
Tune-4524-get.log 9148 Log file, useful mostly for debugging
Tune-45242-get.log 4355 Log file, useful mostly for debugging
Tune-45246-get.log 1528 Log file, useful mostly for debugging
These files should be available for 24 hours.