pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-7337-3311_the_Harp_That_Once.ps) >>/Users/jc/w/tmp/Tune-7337-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Kerr/MM3/3311_the_Harp_That_Once.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_73370.log 336319 Log file, useful mostly for debugging
Coll_73378.log 126255 Log file, useful mostly for debugging
Tune-7337-3311_the_Harp_That_Once.abc 522 ABC music file with the extracted tune(s)
Tune-7337-3311_the_Harp_That_Once.ps 35219 PostScript
Tune-7337-3311_the_Harp_That_Once.txt 522 Plain-text file with the extracted tune(s)
Tune-7337-get.log 4747 Log file, useful mostly for debugging
Tune-73370-get.log 6026 Log file, useful mostly for debugging
Tune-73373-get.log 3488 Log file, useful mostly for debugging
Tune-73379-get.log 4491 Log file, useful mostly for debugging
These files should be available for 24 hours.