pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-2691-Hard_Is_My_Fate-Bb-32-4.ps) >>/Users/jc/w/tmp/Tune-2691-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/air/Hard_Is_My_Fate-Bb-32-4.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
Coll_26917.log 144093 Log file, useful mostly for debugging
Tune-2691-Hard_Is_My_Fate-Bb-32-4.abc 627 ABC music file with the extracted tune(s)
Tune-2691-Hard_Is_My_Fate-Bb-32-4.ps 38238 PostScript
Tune-2691-Hard_Is_My_Fate-Bb-32-4.txt 627 Plain-text file with the extracted tune(s)
Tune-2691-get.log 5120 Log file, useful mostly for debugging
These files should be available for 24 hours.