pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-46590-191_John_Peel.ps) >>/Users/jc/w/tmp/Tune-46590-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/EverydaySongBook/191_John_Peel.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_46590.log 847 Log file, useful mostly for debugging
Tune-46590-191_John_Peel.abc 1319 ABC music file with the extracted tune(s)
Tune-46590-191_John_Peel.ps 37976 PostScript
Tune-46590-191_John_Peel.txt 1319 Plain-text file with the extracted tune(s)
Tune-46590-get.log 4520 Log file, useful mostly for debugging
These files should be available for 24 hours.