pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-13874-1772_Thompson.ps) >>/Users/jc/w/tmp/Tune-13874-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/DftY/1772_Thompson.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_13874.log 1003 Log file, useful mostly for debugging
Tune-13874-1772_Thompson.abc 19468 ABC music file with the extracted tune(s)
Tune-13874-1772_Thompson.ps 128857 PostScript
Tune-13874-1772_Thompson.txt 19468 Plain-text file with the extracted tune(s)
Tune-13874-get.log 17048 Log file, useful mostly for debugging
These files should be available for 24 hours.