Got HTTP status 404 Not Found for "http://john-chambers.us/~jc/music/abc/session/SAFD/Ash_Grove_Standpiece_1.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-95461-Ash_Grove_Standpiece_1.ps) >>/Users/jc/w/tmp/Tune-95461-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/session/SAFD/Ash_Grove_Standpiece_1.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
Form_95461.log 766 Log file, useful mostly for debugging
Tune-95461-Ash_Grove_Standpiece_1.abc 166 ABC music file with the extracted tune(s)
Tune-95461-Ash_Grove_Standpiece_1.ps 6 PostScript
Tune-95461-Ash_Grove_Standpiece_1.txt 166 Plain-text file with the extracted tune(s)
Tune-95461-get.log 27612 Log file, useful mostly for debugging
These files should be available for 24 hours.