pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-1122-tunes.ps) >>/Users/jc/w/tmp/Tune-1122-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/DftY/1776/Thompson/tunes.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Form_11220.log 846 Log file, useful mostly for debugging
Form_11224.log 943 Log file, useful mostly for debugging
Tune-1122-get.log 18042 Log file, useful mostly for debugging
Tune-1122-tunes.abc 22612 ABC music file with the extracted tune(s)
Tune-1122-tunes.ps 150150 PostScript
Tune-1122-tunes.txt 22612 Plain-text file with the extracted tune(s)
Tune-11222-get.log 3916 Log file, useful mostly for debugging
Tune-11223-get.log 188525 Log file, useful mostly for debugging
Tune-11227-get.log 3697 Log file, useful mostly for debugging
Tune-11229-get.log 9368 Log file, useful mostly for debugging
These files should be available for 24 hours.