pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-64208-CR-abc2.ps) >>/Users/jc/w/tmp/Tune-64208-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CR-abc2.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
Tune-64208-CR-abc2.abc 1342 ABC music file with the extracted tune(s)
Tune-64208-CR-abc2.ps 47719 PostScript
Tune-64208-CR-abc2.txt 1342 Plain-text file with the extracted tune(s)
Tune-64208-get.log 4194 Log file, useful mostly for debugging
These files should be available for 24 hours.