pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-23268-Keep_it_up.ps) >>/Users/jc/w/tmp/Tune-23268-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Thompson/Keep_it_up.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-23268-Keep_it_up.abc 433 ABC music file with the extracted tune(s)
Tune-23268-Keep_it_up.ps 33709 PostScript
Tune-23268-Keep_it_up.txt 433 Plain-text file with the extracted tune(s)
Tune-23268-get.log 4435 Log file, useful mostly for debugging
These files should be available for 24 hours.