pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42935-057_Caller_Herrin.ps) >>/Users/jc/w/tmp/Tune-42935-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Chappell/057_Caller_Herrin.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_42935.log 900 Log file, useful mostly for debugging
Tune-42935-057_Caller_Herrin.abc 801 ABC music file with the extracted tune(s)
Tune-42935-057_Caller_Herrin.ps 38968 PostScript
Tune-42935-057_Caller_Herrin.txt 801 Plain-text file with the extracted tune(s)
Tune-42935-get.log 4976 Log file, useful mostly for debugging
These files should be available for 24 hours.