pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-42197-4363_Niel_Gow.ps) >>/Users/jc/w/tmp/Tune-42197-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/book/Gow/CSR/4363_Niel_Gow.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-42197-4363_Niel_Gow.abc 786 ABC music file with the extracted tune(s)
Tune-42197-4363_Niel_Gow.ps 36584 PostScript
Tune-42197-4363_Niel_Gow.txt 786 Plain-text file with the extracted tune(s)
Tune-42197-get.log 4441 Log file, useful mostly for debugging
These files should be available for 24 hours.