pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-4005-4344_Charles_Street_Bath.ps) >>/Users/jc/w/tmp/Tune-4005-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR/4344_Charles_Street_Bath.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_4005.log 1437836 Log file, useful mostly for debugging
Coll_40050.log 483843 Log file, useful mostly for debugging
Coll_40053.log 1227085 Log file, useful mostly for debugging
Coll_40055.log 1399901 Log file, useful mostly for debugging
Form_40054.log 872 Log file, useful mostly for debugging
Tune-4005-4344_Charles_Street_Bath.abc 841 ABC music file with the extracted tune(s)
Tune-4005-4344_Charles_Street_Bath.ps 36954 PostScript
Tune-4005-4344_Charles_Street_Bath.txt 841 Plain-text file with the extracted tune(s)
Tune-4005-get.log 4710 Log file, useful mostly for debugging
Tune-40057-get.log 7323 Log file, useful mostly for debugging
Tune-40059-get.log 4395 Log file, useful mostly for debugging
These files should be available for 24 hours.