pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-77150-Polka.ps) >>/Users/jc/w/tmp/Tune-77150-get.log 2>&1" returned status 256
http://michel.bellon.free.fr/Musique/abc/Nouveau/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-77150-Polka.abc 229 ABC music file with the extracted tune(s)
Tune-77150-Polka.ps 33711 PostScript
Tune-77150-Polka.txt 229 Plain-text file with the extracted tune(s)
Tune-77150-get.log 4463 Log file, useful mostly for debugging
These files should be available for 24 hours.