Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/book/Graded2/BB50.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2644-BB50.ps) >>/Users/jc/w/tmp/Tune-2644-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Graded2/BB50.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-2644-BB50.abc 144 ABC music file with the extracted tune(s)
Tune-2644-BB50.ps 6 PostScript
Tune-2644-BB50.txt 144 Plain-text file with the extracted tune(s)
Tune-2644-get.log 13351 Log file, useful mostly for debugging
Tune-26440-get.log 4892 Log file, useful mostly for debugging
Tune-26441-get.log 7006 Log file, useful mostly for debugging
Tune-26443-cresc.abc 139 ABC music file with the extracted tune(s)
Tune-26443-cresc.txt 139 Plain-text file with the extracted tune(s)
Tune-26443-get.log 3078 Log file, useful mostly for debugging
Tune-26445-get.log 5522 Log file, useful mostly for debugging
Tune-26446-get.log 10839 Log file, useful mostly for debugging
Tune-26447-get.log 1370 Log file, useful mostly for debugging
Tune-26448-get.log 5001 Log file, useful mostly for debugging
These files should be available for 24 hours.