pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-27688-Chorus_Jig.ps) >>/Users/jc/w/tmp/Tune-27688-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/program/Chorus_Jig.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-27688-Chorus_Jig.abc 496 ABC music file with the extracted tune(s)
Tune-27688-Chorus_Jig.ps 35467 PostScript
Tune-27688-Chorus_Jig.txt 496 Plain-text file with the extracted tune(s)
Tune-27688-get.log 5471 Log file, useful mostly for debugging
These files should be available for 24 hours.