pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67814-playf.ps) >>/Users/jc/w/tmp/Tune-67814-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/mirror/bath.ac.uk/exxhf/music/playf.abc

Error exit status 256; here are some files to check:

[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Tune-67814-get.log 4229 Log file, useful mostly for debugging
Tune-67814-playf.abc 282 ABC music file with the extracted tune(s)
Tune-67814-playf.ps 35835 PostScript
Tune-67814-playf.txt 282 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.