pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-37224-polka.ps) >>/Users/jc/w/tmp/Tune-37224-get.log 2>&1" returned status 256
http://michel.bellon.free.fr/Musique/abc/polka.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-37224-get.log 13756 Log file, useful mostly for debugging
Tune-37224-polka.abc 312 ABC music file with the extracted tune(s)
Tune-37224-polka.ps 33906 PostScript
Tune-37224-polka.txt 312 Plain-text file with the extracted tune(s)
These files should be available for 24 hours.