pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-67813-251_But_and_Ben.ps) >>/Users/jc/w/tmp/Tune-67813-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/SCD/BB50/251_But_and_Ben.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
Form_67813.log 820 Log file, useful mostly for debugging
Tune-67813-251_But_and_Ben.abc 680 ABC music file with the extracted tune(s)
Tune-67813-251_But_and_Ben.ps 37786 PostScript
Tune-67813-251_But_and_Ben.txt 680 Plain-text file with the extracted tune(s)
Tune-67813-get.log 7845 Log file, useful mostly for debugging
These files should be available for 24 hours.