pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-26477-498_Castle_down.ps) >>/Users/jc/w/tmp/Tune-26477-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1803/Preston/498_Castle_down.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Coll_26477.log 1263561 Log file, useful mostly for debugging
Sess-26477.log 53682 Log file, useful mostly for debugging
Tune-26477-498_Castle_down.abc 835 ABC music file with the extracted tune(s)
Tune-26477-498_Castle_down.ps 33846 PostScript
Tune-26477-498_Castle_down.txt 835 Plain-text file with the extracted tune(s)
Tune-26477-get.log 10279 Log file, useful mostly for debugging
These files should be available for 24 hours.