pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-89866-Jefferson_and_Liberty_1-Am,G,C,Em-32-2,3.ps) >>/Users/jc/w/tmp/Tune-89866-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/session/jig/Jefferson_and_Liberty_1-Am,G,C,Em-32-2,3.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-89866-Jefferson_and_Liberty_1-Am,G,C,Em-32-2,3.abc 2585 ABC music file with the extracted tune(s)
Tune-89866-Jefferson_and_Liberty_1-Am,G,C,Em-32-2,3.ps 47812 PostScript
Tune-89866-Jefferson_and_Liberty_1-Am,G,C,Em-32-2,3.txt 2585 Plain-text file with the extracted tune(s)
Tune-89866-get.log 5343 Log file, useful mostly for debugging
These files should be available for 24 hours.