pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-21958-4173.ps) >>/Users/jc/w/tmp/Tune-21958-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CSR/4173=Fingalls_Lamentations.abc2.abc

Error exit status 256; here are some files to check:
[get.cgi V=1/1 B=0 scale=0.55 512x512 PNG]
filesizedescription
Tune-21958-4173.abc 1095 ABC music file with the extracted tune(s)
Tune-21958-4173.ps 40855 PostScript
Tune-21958-4173.txt 1095 Plain-text file with the extracted tune(s)
Tune-21958-get.log 5087 Log file, useful mostly for debugging
These files should be available for 24 hours.